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Is this a capacitor or a battery? Answered

In regards to my "battery free bike light".   I was told that a dynamo flashlight charges a capacitor.  Is this the case? Take a look, Thanks

Question by onrust    |  last reply


Will this battery explode??

Silly question, but I really wanna be on the safe side.  I just received this battery charger for my phone, but wanted to change the case, so i removed the original case.  Then I looked at the battery, and saw that the (-) of the battery is not soldered to the PCB at all, only the (+).  I know that lithium batteries are dangerous, so I just wanted to ask if it's safe to use. It was like that, I didn't accidentally rip it of. There are even no marks on the (-) connector sticking out from the battery. Can someone please let me know if it's safe to use?  I added some images pointing out the place and the board.  Thanks a lot for your help. George 

Question by grancharov    |  last reply


How is this battery spring plate attached to the plastic casing? Answered

Hi, The picture is showing the battery compartment of my kitchen scale. I would like to use this principle in my design and wonder if anyone can tell me how the metal springs are attached to the plastic? Double molded, glued, clip-in...? My design does not have a PCB, which I suppose this scale has.  I am not an electrical engineer so sorry for a confusing question. Thanks!

Question by karolina81    |  last reply


How would you make a battery holder for a AAA battery?

I make many small motorized things but have never found a good way to keep the wires on to the battery, i have used dog-eared paper clips and i can't find a single AAA battery case. Soldering batterys is annoying because i have a horrible soldering gun. Duct tape is what i normally use but it is annoying to have to take it all off to see if there is a problem.

Question by Stephen D. Alverez    |  last reply


Can you power a 12v case fan with a 9v battery? Answered

If you can't, then where can you find a 12v battery connector ? I looked everywhere and couldn't find it. BTW, I am trying to build this https://www.instructables.com/id/Simple-Bots-Scrub/? Thanks

Question by panli19    |  last reply


iPhone 3gs run on Exernal battery only

Does anyone know if I could run an iPhone 3gs off of an external battery case if the phones internal battery is broken or missing?

Question by cardboarddude  


how do i open the battery case on my M-4 airsoft aeg? it uses a battery case disquised as a flashlight. Answered

I can't use my new gun because I don't know how to open the battery case. the instruction manual only says to put the battery in, it doesn't tell how to open the battery case.

Question by nerfer    |  last reply


protection tips for lifepo4 battery?

Its a 24 v 30 AH battery to be used in a trike.Apart from the protection circuits  what(materials) could be used to fill the battery surface to avoid more damage to the vehicle in case of a disaster? Any usual practices?

Question by Nr-Think different    |  last reply


deep cycle battery pack

Does anybody know what parts I'd need to make a 12v rechargeable battery pack for an upcoming road trip? I also need to know where I can find deep cycle sealed lead acid batteries for this project. I waited long enough to make a lithium ion pack, but now I changed my mind on the battery type to get 12v, and now I have no idea of what protections and electronic components I need for it. I'l post more info on available casing later, but I'll tell you now that it's like a small blue lego briefcase from when I was little. It's about the size of a texbook and I'd like to be able to put it in a small backpack to carry around school sometimes for my windows tablet. Update: I am available to buy any particular case, but wiring in a case can sometimes look bad, so I'd like it to store all wires internally and have a friendly look. Appearance was part of why I switched my plan from li-ion 18650s to lead acid. A block with printed volt and amp information looks better than a group of oddly sized cells. Also, no clocks.

Topic by leaf26    |  last reply


Rechargeable Battery Help?

I'm sick of throwing away AA batteries, and I go through a lot with my camera flash. The only rechargeable, multi purpose batteries I've used were some generic energizer ones I got some years ago, so I need your recommendations.I'm willing to spend a bit more for a quality charger/batteries that will last. For batteries, I'd like to support Eneloop, as they sponsored an instructables contest in the past. They are significantly better than Energizer/Duracell, right? How does Rayovac compare in price/power?For a charger, I was looking at the the BC-9009 by La Crosse. It has good reviews, charges slowly for a slower drain, prevents overcharging and has all sorts of other features. It comes with 4 AA, 4 AAA batteries and a case for $40. See it here:http://www.amazon.com/Crosse-Technology-BC-9009-AlphaPower-Battery/dp/B00077AA5Q/ref=sr_1_1?ie=UTF8&s;=electronics&qid;=1251579646&sr;=8-1I don't know how good the la crosse batteries that it comes with are, though. The BC-700 would work fine and can be bought alone for $30.For packaging reference, I need to have at least 8 AA batteries, but would definitely use any extra AA or AAA that might come with it.So, what do you have to suggest? Thanks!Update: I read that energizers may be better than eneloops for things that use a lot of power quickly (like a camera flash) while the eneloops are better for things that use it slowly (like a remote control). Is that true? I'm concerned about getting batteries that will store a lot of electricity over many charge cycles, but not so much about them holding a charge during storage.

Topic by Weissensteinburg    |  last reply


Design help for battery powered LED lighting for display case? Answered

I wonder if people might have suggestions for battery powered lighting for a display case? The all glass case (except for base and canopy) now has an AC powered four MR16 halogen system. I want to replace that because of the heat, and because I don't want a power cord running from canopy down the glass sides. Ugly. I'd like to replace those bi-pin halogens with LED lights and power it all with a rechargeable battery. The canopy over the six foot tall case is 4" deep by 15" wide by 70" long, open at the top. I'd like to conceal the works in that 4" space. I'd want the battery(s) to be easily removeable and reinstallable for external charging. Long life to maximize intervals between charging would be a big plus. The lights would typically only be used when we have visitors. Maybe for as long as a couple of hours several times a month, but probably typically for much shorter periods. Ideas? Thank you. --David

Question by davidqxo    |  last reply


Car Alternator Battery Charging

Here is an alternator. 75 amp 12 volts. But i m not sure how to connect the 3 wires.. what i know is that screw in black plastic case is battery +ve and alternator body is battery -ve, Please guide me how to use other 3 wires ( green black and yellow). Thankx in advance ;)

Topic by SyedA58    |  last reply


PLASTIC SCREEN CASE REPAIR

Hallo guys, I have a proble torching me last days. My wife owns a laptop made in Poland (aktino). Anyway iam fixing this so cause is about 8 years old running XP and i restorating, fixing all broken plastic parts, battery, i also put a wifi stick inside the empty space of the floppy disk. All work nice and also repaint all the case and added new stickers like new. once i will uploade the repairing moments but now my biggest proble is the external case of the monitor. Is broken appart in 3 pieces and the 2 of them I succeded to glue then very secure and tight but the third for an unknown reason wond be glued and this a kind of problem. Its not posible be different material than the whole case wich is glued perfectly please iam looking forward your suggestions and recommendations thanks in advance Agis68

Topic by agis68    |  last reply


Battery Holder From Dilated PVC Hose?

I'm trying to widen about 1 foot of PVC hose. Ie. I want to dilate the interior diameter so 4 AA batteries will fit inside end to end. I'm trying to make a battery holder for my helmet light. The PVC hose is like siphon tube and I want to use it as a battery holder but it's a little too narrow. I tried heating the hose up with steam and jamming a lubricated metal pipe inside. This worked for a few inches but then there was too much friction. I also tried a smaller metal pipe along with a chopstick but I ended up puncturing the hose. So the question is: What is a good way of getting this segment of siphon hose a little bit wider? Or what else would be a nice waterproof and discreet battery holder for a helmet?

Question by snotty    |  last reply


DIY battery setup help

Hi, I'm a first time DIY-er and would like to build a useful, long lasting battery pack for my *new* laptop (late summer). I'm 17, and this would be a perfect project for me to finish in the next few months. I'll be working with my dad and asking my physics teacher, who seems very all-knowing, for advice. My teacher understands electricity and batteries better than anyone else locally and is leading our STEM team, of which I am a member and need this experience. Keep in mind that I'm not just doing this to have a (much needed) battery pack for my laptop. I got most of my information from here and will most likely be purchasing new batteries. As far as the housing of the components, I have a hard plastic, 10+ year old lightly used blue lego container in the shape of a kid-sized briefcase.  Case: Old blue lego carrying case, 11” x 7.5”(9 including curved  front) x 3.5” Insulation tape Batteries: (x4) Battery holders: (x4) PCB: (protected voltage is higher, balance charger required) Balance Charger: Fuel Gauge: DC port: Wire terminals (for organization) Balance charge cords: Optional inverter: I heard about these being inefficient, so I'm not sure about it. Please inform me if there are any other parts that I'll need or if I've left out any information. Also Inform me if everything I'll need for a lithium battery pack is on this list. P.S. The case was chosen based on the fact that it will fit in my backpack with my books and looks much less alarming and more like a DIY battery than a black box or briefcase. especially with the fuel gauge and plugged in laptop.

Topic by leaf26    |  last reply


Battery Powered Water Heater

I want to make a portable steam generator for my school project. So I want to know if there's any battery powered water heater (that can be used to generate the steam) The steam generator device will be used to help you unwrinkle your clothes without ironing them (in case of no electricity or laziness) so I need any battery powered water heater that is strong enough to generate a lot of steam. Please help or give suggestions. Thank you

Topic by WafiqahK    |  last reply


Ridgid Seesnake monitor case is not working?

I sent this out to the Ridgid repair people and they sent it back without a phone call telling me that the problem is a bad battery charge board?  Is there any way that I can rebuild this case or adapt it to work again with the existing reel?  I would like to see if this is a possibility before I entertain the idea of purchasing a new monitor.  Any ideas?

Question by DomenicD    |  last reply


Can I put an ipod in an iphone case? Answered

Hello, I could not find a cheap case for an ipod touch that has a solar panel and a battery in it, so I want to put my ipod in an iphone case. I have a ipod touch 4g, and I am hoping that I can just use some sugru to fill in the extra space. Does this seem like it will work well with the case in the link?    http://dx.com/p/1500mah-usb-solar-rechargeable-external-battery-with-silicone-case-for-iphone-4-3g-3gs-black-94466

Question by jbaker22    |  last reply


How to wire 12v dc case fan to 1x9v and 2xAA batteries? Answered

Hi there! I'm planning a project using a 12vdc case fan to inflate a plastic bag for a school project. I have located a 9v battery clip and a 2xAA battery holder and was wondering how i'd go on with wiring them together. I was also wondering if it was possible to reverse the polarity, thus creating a vacuum effect. If so i'd like to have a 3 prong switch to control the case fan. I appreciate any help you could provide me. Thanks!

Question by williamhaze    |  last reply


battery powered water bottle

Hello,  I'm interested in possibly modifying a water bottle with an attached battery and some heat coils, so that it could slowly melt snow in to drinkable water.  When I hike during the summer I carry little water because I'm refilling from streams regularly, and I'd like to do the same thing during the winter.  I don't normally build things on my own, but in this case I can't find any product like this.  I recognize that doing this requires quite a bit of power, so I'm not sure if it will end up being feasible or not.  I'm willing to carry quite a few batteries, however.  For a big mountain ascent, it's not uncommon to carry 4-5 liters of water, so we're talking about 10 lbs of water.  So even if I had to swap out batteries a few times, it would still be worth it to do that.  Any thoughts on the feasibility of this idea, and if so, how to proceed with it?  thanks, Chris

Topic by thaycw1    |  last reply


Gps Tracking Device Extended Battery

First ever post after years of lurking. Searched but couldn't quite get the right answer. I'm trying to extend the battery of my GPS Live tracker. Currently I get 3, sometimes 2 days before the battery gets so low I must recover it. I saw where advertisers are selling 10 day batteries for up to $600. Just too much for me. The first picture is a completed model being sold on the internet. So I ordered the battery, ($58) and the charger ($45). Tomorrow morning I'll go find some connectors that match the charger and that I can use as a connector on the GPS. I'm going to go through the hacked battery case. I'll rig the the wires to match the holes then fill the empty case with hot glue to hold it in place. This is my big question: There are 3 electric tabs on the GPS. I have + and -. Can I just ignore the center tab? I will then run the wires through a hole I'll drill in the Hacked battery case. To a connector-connecting to battery. Any issues? The battery has a Built-in IC chip. I am assuming that is an IC chip on the old battery removed. I appreciate any input. Thank you.

Topic by elrog69    |  last reply


Battery support with Intel Compute Stick

Hi, I've been working in a project that is basically an Intel Stick with Z8350, a 7 inch waveshare screen and joystick buttons in the case. The idea is to be able to play windows games like Skyrim, Borderlands, Fallout... Anyway, I've come to a point where everything works just fine, right now I'm designing a 3d printed case to fit it all inside and take it to the go. I was planing on using a battery meter with LEDs to know the charging state and current state of the battery, but I just have been wondering, is there anyway to add battery support with windows 10 reading? just like a laptop, you pop a battery and windows gives me the percentage left and charging status. I plan to post a instructions for this when I finish it as well with the 3d print files and part list. My thanks to all!

Question by deadlyredink  


Battery Power Capability (C)

I'm trying to understand a little bit more about batteries. I've learnt so far: "Volts,  amps, and  watts measure electricity. Volts measure the “pressure” under which electricity flows. Amps measure the amount of electric current. Watts measure the amount of work done by a certain amount of current at a certain pressure or voltage." Now I'm interested in knowing the maximum amount of energy you can draw from a battery at any one time. I presume you can't instantly drain a batteries full energy capacity at any one time. I have read that: "The way the power capability is measured is in C's. A C is the Amp-hour capacity divided by 1 hour. So the C of a 2Ah battery is 2A. The amount of current a battery 'likes' to have drawn from it is measured in C. The higher the C the more current you can draw from the battery without exhausting it prematurely. Lead acid batteries can have very high C values (10C or higher) , and lithium coin cells have very low ones (0.01C)" Am I write in saying a 1.2V 1200mAh has a power capability of 1.2C? In which case I should only ever draw 1.2C or less to preserve the battery? How do I increase this amount when using 2 batteries, if I wire two batteries together does the power capability increase to 2.4C for the above example batteries? If so do I have to wire them in parallel or series for this to work? Thank you.

Topic by jakespikey    |  last reply


Charging batteries (in my case a 9V) from a Multi voltage wall adaptor?

Hi All, I would like to charge a 9 v rechargable battery from a power adaptor similar to the one below.  Can I just add a female plug to the battery and charge it direct?  Is there an optimum female plug that I should use?  Any advise would be handy. Thanks

Question by lonesoulsurfer    |  last reply


Ipod Solar/Battery/Wall/USB

 So after perusing a few instructables such as minty boost and others, I have decided I shall make a travel charger. Kind of. Basically the idea is an all in one, pimped out ipod case. I have most of the parts already, and I work at radioshack so I can get whatever I need. This case is going to have an external speaker mounted to the back of the ipod touch, directly above a rechargeable battery (nine volt?). The solar panel will be mounted behind that facing outwards and on a hinge that will allow it to unhinge out and act as stand as well.  Hopefully this is making sense.... I'm thinking that the ipod needs to be charged via the battery, which will be charged both via solar and occasionally wall. The speaker I also plan to run off the battery, so this will have to be some battery!  Like I said, I work at radioshack so I have access to all kinds of stuff, so the best possible battery for this scenario is what I'm looking for, along with any advice on this. I'll make an instructable also if anyone would like. Thanks!

Topic by ShiesTech    |  last reply


18650 battery pack question

Hello everybody, I need to install (build) a recharging battery pack for my plant shelf.  it will be running an arduino nano, just 3 leds (3mm 20ma each) 1xNTC and 1x water sensor probes (nails).--  no LDR no yellow LED. . I was thinking about getting a 2x 18650 battery holder - I need more battery hours, should we wire the batteries in parallel to get more mAh and boost them 3.7V to 5V. so basically this is what I am trying to custom build to get more hours; DIY Mobile Power Bank Case Kit . I would just buy the mentioned product BUT under specifications>battery it says the capacity range: 1000mAh and below. but the batteries I have are 3.7V @ 5000mAh. does this mean that the remaining 4000 will be lost because the system can't handle it?  . basically what I am asking for is how can I make a long lasting arduino nano powering 18650 battery pack BUT also with a recharging module. these are the items I found that may work together, please remember that I have no electrical experience from before. I have learned everything that I know from instructables, this is a too advanced build for me to figure out without asking a few questions. thank you for your patience, let me know if I have to clear anything out. batt holder:  recharger: boost: am I even in the right track with this thing? can these be connected together and a switch. again, the goal is max battery life.. maybe add 4x 18650 - 2in parallel + 2in series, 7.4V to arduino Vin, eliminate the booster, even more battery life ? . thank you in advance, love & peace akin,

Question by Akin Yildiz    |  last reply


Usb battery bank help and questions ?

Well i want to add like a battery pack instead of the 9 volt batteries i have now and this a ruff model i made today, but i will make a better case but back to my question is would this work? http://www.amazon.com/Tenergy-2000mAh-Capacity-Battery-Security/dp/B001BA292A/ref=sr_1_11?ie=UTF8&qid;=1347244925&sr;=8-11&keywords;=9-Volt+Rechargeable  or do you recommend something else it has to be rechargeable,  

Question by imnew59585    |  last reply


Request: An Internal UPS or battery for a PC

My town has been experiencing power dips and short outages. i bought a cheap ups but it doesn't really do the job (the PC still cuts out) but i noticed that my laptop carries on just fine (obviously because it has an internal battery) so that got me wondering. Inside the pc it's just 12v and 5v isn't it? surely you could set up a battery inside the case that works just like the one in a laptop. anyone fancy giving it a go?

Topic by the.dwarfer    |  last reply


power loss in battery chargers...USB

A transformer, being a pair of electromagnets, such that it reduces the voltage of household power to whatever voltage your battery powered device needs, will cost you somethin if its plugged into the wall, even if yoour phone, laptop, etc isn't plugged in. but it seems that these 5v usb chargers are too small to contain a transformer. I dont think they get warm when they are idly plugged in.  I imagine they may just have a rectifier and zener diode. Is that the case?  Do they waste power when left in an outlet?

Topic by Toga_Dan    |  last reply


Dewalt battery powered inventions

Hey gang, 1st time, long time. I'm not very savvy when it comes to most things electrical, but have a question about (mainstream) rechargeable battery powered inventions.  In my case, Dewalt 18v batteries, but for arguments sake, it could cover a slew of rechargeables. I have at least a dozen Dewalt 18v tools and accessories.  I've had most of them for years and only the 2 most well-used tools have failed (and been rebuilt).  So I love the reliability.  I 'round-robin' my 6 batteries (mix of the older style XRP and the new Li-Ion), I've yet to have a battery fail and all still hold a decent charge - the oldest XRPs are going on 7-8 years old. I often use my (2) dewalt lights I have as light when the power goes out in the house or when I spend a few nights at the race track (tent camping, but not roughing it like out in the middle of the woods).  3-4 batteries typically do the job for a weekend.  I'm on the fence about buying a Dewalt (charging) radio, but it doesn't seem like it will charge via USB when it's running on battery power.... ...which leads me to my main (ignorant) question: Why don't we see inventions that can be powered by main stream rechargable battery (reliable, safe, readily available, and owned by many people already)? A couple examples include: A device to charge small electronics via usb (Cell phone, tablet, etc).  Smart phones can do so many things now, being able to charge it with existing batteries would make them even more universal (http://www.huffingtonpost.com/steve-cichon/radio-shack-ad_b_4612973.html ) A small fan, something pretty portable.  (yes, I know I could probably rig something up with my drill, but having a dedicated fan would be nice) A small water pump.  (again, ignorance comes into play here)  Not sure what kind of pressure/flow rate is possible, but having it connected to my rain barrels to increase the pressure over my current gravity feed setup would be nice.  I'm not looking to pressure wash, just want to be able to have some more pressure. (minor update: An ebay search yielded one for sale, looks like I'm no pioneer here) I should have wrote the others down, I recall having a few more ideas. Any input from a knowledgeable person on the topic would be appreciated. And for those that may argue that buying these devices and using standard batteries (AA, AAA, C, D, etc) would be a cheaper investment.  You're right! (IF you didn't already have a bunch of tool batteries, which is my point) Regards

Topic by JustLuckey    |  last reply


Mini underwater robot (casing ideas?)

This idea is in the preliminary stage at the moment, I have a good level of understanding of all idea's implementation but I need some help with the casing (and battery). Without giving too much away (wouldn’t want to spoil the instructable surprise now, would we?!); basically it’s an underwater BEAM bot, it’s mainly static but it has some "flailing" arms that can move around in an interesting fashion. Said arms can wiggle in two dimensions (above and below the plane at which they are detached - think elbow that can bend back and forwards) and are composed of a levered magnet/coil combo. The entire thing will probably have three arms, all on the same plane. I also need a small rechargeable/replaceable power supply, emphasis on small (the project needs to be somewhere near neutrally buoyant), and some way of recharging/replacing it. Any ideas would be most welcome. Now, since I’m using electronics underwater I want to make sure water cannot get in; problem is I don’t know how. I have had some ideas about some sort of thin sealed plastic, i.e. two pieces of plastic cut to shape and sealed around the edges, but then charging becomes an issue. Plastic would otherwise be ideal. Please keep in mind that I’m a student and cannot afford anything more expensive than a good lunch. Finally, would this make good instructable material? I’m hoping to have a design no more complex than a basic beam bot, as it is at the moment the part count is very low... Thanks

Topic by andy    |  last reply


Question about using LiPo Batteries

Hello, I would like to use a 3V Solar cell rated at 45mA to charge a LiPo Battery (3.7V) rated at 200mAh. am wondering. How long should I allow this to sit in direct sunlight to charge without overcharging the battery? I would also be adding an inline switch to shut off current from the solar cell. Here are the links to the products I would be buying (In case it helps) Solar Cell: (Its about half way down labeled "3.0V 45mA Solar Cell") https://www.futurlec.com/Solar_Cell.shtml Battery (Note I'm only using one) http://www.ebay.com/itm/2x-3-7V-240mAh-30C-Li-Poly-LiPo-Battery-Pack-For-RC-Micro-Helicopter-Air-plane-/300715147936?pt=Radio_Control_Parts_Accessories&hash;=item46040502a0 Thanks

Question by Tuckoguy    |  last reply


LOW COST BATTERY for CELL phone

My old LG flip phone still has lots o' pics, contact info, etc. I don't wanna throw it out, but the battery no longer holds a charge. I'd like to recycle the old battery, but when plugged into a charger with no batt, the phone  will not turn on.   Why can't I power it up on the wal-wart transformer alone?  Do I really need to spend $40 on a battery just to access old pics n stuff? Is there some proprietary circuit in there that "says" to the phone "I'm here"  other than just plain old voltage? Although the old battery seems to work just well enough to access data as long as it's plugged in, I'd like to get rid of said battery in case it eventually leaks.

Topic by Toga_Dan    |  last reply


The Ultimate Man Laptop Case (While going green!)

Hey everyone, I recently just had the idea of making the ultimate man laptop case, and once i get some $$$, it will be put into affect. Its body will be made out of a harbor frieght tools case (metal), gonna cut out the front and reinforce with wood, then goes on (2) 6v solar cells. Behind on the inside there will be foam surrounding the DC Volt reader, and if i can manage, two cheap portable speakers that i have that run off a USB cable/aux. They can easily be converted though. Im going to cut out a slot for my SSD to be placed as well as some headphones if theres room. On the bottom part, im going to send those wires to the power controller for the /solar/ and the /battery/ which will be a 12v Gel RC Car battery (long ones that are fairly big). After that comes the DC-AC inverter which will be disected to save space and the plugs will be movable. SPDT switch comes next to switch from 12v to the 5v USB hub thats gonna be installed. Foam will encase everything, then im throwing some .25 aluminum sheeting on top for a nice finished look. This whole project should run me about $350 or so. I realize this case might be heavy, but I think once most of the parts have been sheded of there cases then I think it might be a little lighter. Going to overheat and/or short circuit something? I plan on making a channel for each seperate item in the foam, and throwing 2 USB fans on them. Any help would be greatley appricated with this project :)

Topic by Darkshot    |  last reply


Can you change the shape of an Ni-Ca battery? Answered

From my experience a battery is a collection of cells; and since Ni-Ca batteries are cased in heatshrink you can see the various cells it is made up of!  As I just bought the wrong battery for my airsoft gun (it is way too big) I thought if I took the casing off and disassembled it into various batteries could you then turn it into a stick battery? May seem obvious; but I'm new to this :) Thanks

Question by Digital Flame    |  last reply


Canon USB/AA battery charger?

I'm looking to do a very long backpacking trip and was wondering if there was any way to charge my camera's battery without being plugged into a wall outlet. This applies to lots of these bigger batteries, but in this case I'm looking at the Canon NB-7L, that works with the PowerShot series. Litium-Ion, 7.4V, 1050 mAh. As far as I can tell, there is no way to charge this battery without these big wall chargers, although there are some off-brand variations which allow for power from a cigarette lighter adapter. Anyone have any brilliant ideas on how one would go about getting power to one of these batteries, via charger or otherwise? My main problem seems to be that all the alternative power sources out there (solar chargers, mintyboost, yada) provide their power via USB, which doesn't seem to do me much good. I know there's beefy battery packs out there that would work, but in the interest of saving weight, I'd rather not spring for a brick that weighs more than my tent. Any input is greatly appreciated. Cheers.

Topic by sumo230    |  last reply


Has anyone put battery operated mini LED spotlights in an acrylic display case?

I was  given  a Bradford Mint 1:24 scale 1966 Mustang convertible model car for my birthday. I want to display the car in a lighted acrylic 10" cube and a 3" base. I am asking the Instructables community for their help, as I have never undertaken a project like this before.To begin the car measures about 8" Lx 4" W x roughly 4" H. Now, here are my three questions. First, would an AA battery power source run a switch plus 4 LED violet spotlights? Second, what can I use to attach the LED's to the base? And is there a way to harness the LED light to only highlight a specific point on the model car ? I have never undertaken anything like this before. And although I can picture the look I'd like to achieve in my head; I'm very much in the dark about a lot of the details needed to get the job done.Any help on any one or all four of my questions would be greatly appreciated.  Thank you, Cathy

Question by polus    |  last reply


Lithium Ion Battery Shut Off

Hi, my name is Jackson Pugliese, and I am currently building a battery pack that will be consisting of multiple lithium ion batteries. Getting the pack itself together, is not an issue at all, however, what is an issue is battery shut off when charging.  I would like to be able to charge my battery pack with some form of laptop charger, that outputs 12v, for a 14.8 volt lithium battery pack. The main issue is overcharging. Lithium ions explode, or catch fire if they are over charged, and thus is not an option for me, so to find a solution, I searched the internet, and two things came up.  Option one, use some form of battery charger, that automatically shuts off when It is fully charged (which i do not want to do because I want to do it differently hence the instructable) And Option two, which came up alot, but i do not fully understand is I use something such as this  http://www.amazon.com/Yeeco-Current-Polymer-Lithium-Protection/dp/B010NM52LG/ref=sr_1_2?ie=UTF8&qid;=1456701414&sr;=8-2&keywords;=protection+circuit+module+14.8+volt I do not understand what it truly is, nor how to use it, and would like someone to explain to me both of those things. Everything I am doing is safe, because I am using a en closer for lithium ions, in case if they explode or catch fire, so know one has to worry about anything not working. Thank you very much everyone for your time, and have a wonderful day!

Topic by merlinj    |  last reply


Powering an Android Tablet without a battery?

So I bought my sister this Visual Land tablet about 2 years ago. Eventually both the mini usb and charging port broke off from the logic board as expected from a cheap product. So I have this nice idea of using the tablet as a car nav/entertainment system. simply get rid of the battery and push 5v via a standard cigarette light usb adapter or make one with some 5v regulators and done. I tried resoldering the charge port. I get 5.23v on random points on the board but I get 0v at the battery with the charging port connected. I pulled the battery and tested the terminals on the board with the charging port connected no battery, 0v at the board and the battery alone is also 0v most likely dead and trash as it sat for 1.5 years in a shoebox untouched. So I pulled out my homebuilt psu power supply and hooked up the variable output to the battery terminal on the logic board. When pushing 3.7v~ I can get the first splash screen to show up but the tablet shuts off right after. When pushing 3.8v any thing higher the first two splash screens show and android starts to boot but the tablet powers off soon after.. So i decided to risk it and pushed 5v directly to the board. It started up fine and booted into android normally except for the low battery issue and some heat coming from the processor. Maybe a heatsink and rigged laptop fan into the casing could fix that? It shut off normally as if it had a dead battery. How much voltage doeas a generic android board need? Current?Does the board take 3.7v but since theres no battery it wont boot? How could I fake a fully charged battery? Or could I possibly flash a custom rom? Do you guys need more info? I could provide more pics Note that the battery is a 3.7v 3500mah li-ion battery with only a positive and negative hookups. Also i took some tape and covering off the battery to see if it possibly had its own controller board. It did have a small  pcb board but it seems that its only "a transfer" board, it takes the power from this cloth like cable and passes it into the wire thru the pcb. Should I try to hookup 5v straight to the battery to test it out? Battery has 0v so it might be useless.

Question by mcarrascoza    |  last reply


Replace a new circuit board and batteries of a Braun 7526 shaver?

What is the step by step process of opening/splitting the case and replacing the circuit board and batteries of a Braun model 7526 shaver? Thank You, Fred Tripp

Question by Fred Tripp    |  last reply



Project Help - USB Charger AA batteries

So i wanted to try and pick peoples brains about this and surprisingly my web searches havent really returned anything fruitful on the subject. I have an electronic device that uses 4 AA batteries in series (6v) in a standard arrangement. Due the relative newness of the product and the way the battery compartment is shaped, its basically impossible to replace them with a 6 volt pack and its equally tiresome to use rechargeables as the battery compartment is screwed shut and this is designed to be a portable device. Ideally what I would like to do is remove a section of the case and embed a micro usb socket and setup a charging circuit to the existing battery compartment and stick some long life (lion maybe) AAs in there then just leave the compartment shut and charge via the usb port. Maybe add an led indicator for charge level, i dunno.  However, while i can solder with the best of them, the actual engineering part of laying out the necessary circuit etc is wayyyyy beyond my skills. would anyone be able to assist? Would it be easier to just scrap the battery compartment entirely and stick a battery pack inside the case that was 6v and many many many mah and hook the charge circuit up to that and its leads to the wires going to the compartment and leave it empty? theres plenty of hollow space inside the appliance itself. Second, the device itself doesnt have a "hard off" switch, it has a momentary to boot it up and a reset button. The momentary is constantly being hit in travel and turning the device on, draining the batteries. Theres no internal memory to worry about being wiped, so id love to slap a slider switch on there to kill power to the whole device unless its physically toggled, especially if im cutting a spot for a usb port as well.  Anyone willing to help consult to bring this to fruition? Ill happily give you full credit and buy all parts and what have you, and do all the solder work, just need someone to help me plot out the circuits, decide best course of action, and design a nominal breadboard to slap it together for testing.  

Topic by xBenedictx    |  last reply


Laptop battery to charge cell phone or tablet

I have a couple of L11S6Y01 Lenovo Lithium Ion batteries 10.8V nominal, 48WH, 4400mAH batteries and a couple of their AC adapters lying around the house. I was looking up the Minty boost DIY battery back up and I was thinking of making this battery back up kit to recharge my iPhone and Samsung tablets, both of which can connect to USB power sources. My idea: 1) Get a 7 pin connector that will connect directly to my AC adapter. For example: http://www.ebay.com/itm/External-Laptop-Battery-Charger-for-Lenovo-IdeaPad-B570-G470-G570-Z570-L09L6Y02-/121091427052?pt=Laptop_Batteries&hash;=item1c319c8aec Maybe I can scavenge one such connector from this place:  http://www.ebay.com/itm/IBM-X60S-Battery-Connector-/350772373819?pt=UK_Computing_Other_Computing_Networking&hash;=item51aba9a93b 2) Build a circuit similar to Minty boost : http://www.ladyada.net/make/mintyboost/icharge.html Except in this case, my source is a Li Ion rechargeable battery instead of 2 AA batteries. Any ideas and thoughts would be appreciated.

Topic by Baron_Kaz    |  last reply


Solar powered cell phone charger case hack

After finding solar chargers and DYI solar videos I had an idea... I'm getting an HTC Evo soon. This phone has a lot of screen real estate. It's going to require a decent sized hip case. Why can't I slap a couple solar panels on the outside of the case with a small USB cable plugged into the phone while it's resting on my belt? I want to take advantage of the size of this thing and have my own hacked solar case. So here's my idea. I want to grab a couple panels out of some all-weather garden lights. Mount two solar panels to the outside of a good case when I find the right one. Then add a 5V regulator wired to a mini-USB plug. When I put my phone in it's pouch I could just plug the end of the short wire into the phone to charge it, or at least help it keep a charge while I'm out and about without having to worry about carrying around a solar kit to pull out and pay attention to. The reason I need advice. I don't know much of anything about solar panels other than what I've heard in other DYI tutorials. I'm not an electrician so I don't know much about the power requirements of the phone outside of standard USB voltage. What would I need for amperage requirements? Is a 5V regulator enough to ensure no damage to the phone? The phone will only pull as much amperage as it needs as far as I understand it. Will the phone safely stop charging when it's full or will I blow up my battery? I know they make cases for iPhones like this for $80+. I think I can build one for ~$20 save for the actual case itself. Any help would be appreciated. Thanks *EDIT: A little bit of clarification on my project. I've looked at a lot of other Instructable projects as well as ones all over Google. I've got a lot of good info from them, and I know I *can* do this, but because I'm trying to charge such an expensive device I want to make sure I have every little detail worked out. I've read warnings about issues with part of a solar cell being in the shade (wasn't detailed on why). With my scope of electrical understanding, I would feel comfortable following these guides if I was doing the exact same project with the same amount of panels, but I'm going to have to change things up a little bit mainly due to space and weight constraints since this is going to be mounted on my hip. The biggest requirement here is that the panels produce enough power to charge a USB device without having to trickle charge a separate battery first. I won't have the space on my cell phone pouch for an extra mounted battery. The entirety of this device should be no more than the pouch itself, one or two solar panels and a few wires. The main concern here is getting the amperage I need to charge the phone faster than it drains with only one or two panels.  I'm not looking for step by step instruction here, just a bit of advice from someone who knows a thing or two about PV to give me some tips on solar panel size and power. Also any safety precautions I need to take to keep from causing electrical damage to my phone.

Topic by HittingSmoke    |  last reply


Black & Decker 18 volt charger not working

I have three Black and Decker, 18volt battery chargers, for the FireStorm series tools. One is an orange dual charger. One is the single black charger that came with the drill. And one is the Radio charger. The radio charger AC adapter case melted and no longer works. The single and double chargers both seem to kill batteries, and do not charge. I have voltage coming from the chargers, but I don't remember how much. Does anyone know what the voltage should be on the charger? More importantly, how do I repair the charger to output the correct voltage/current?

Topic by xTiltx  


I need D cell battery replacement strips. Answered

I am trying to replace/fix the battery strips on a Coleman 5329 florescent lantern. Coleman (.com) is out of the original bottom and top replacement parts. Can anyone tell me where I can find battery strips to replace the corroded originals? They are strips with a hole that goes over a stud in the plastic casing. The lantern has a 'U" florescent bulb and uses 8 D cells. I thought some of you might have the answer, or point me in the right direction. Thanks in  advance for the help.

Question by asgard7    |  last reply


Small power source

I was planning to make LED jewelery, but would need a very small power source. In the best case it could be powered by the body's movement. Is there anything small enough to bit on a wrist, yet can power about 10 LEDs?

Topic by DemonDomen    |  last reply


Powering 12" - 17" LCD screen with a battery - possible?

Hi there - i had an idea for a project but am stuck on the techie details, hopefully someone can help! The idea involves a freestanding LCD monitor running on battery rather than plugged into a wall. ideally the the battery would be as small as possible and concealable. Also, i would like to strip the monitor of its casing and if possible connection to a computer and have it just display a single video clip on loop that would come from a source directly connected to the display - would anyone know how this could be achieved?? thanks in advance to any and all responses! PS i cannot use a tablet, for cost reasons and also i need the screen stripped so as to attach it to the final installation. 

Topic by tsunamigirl    |  last reply


Balance charging li-ion ?

So I bought a replacement battery for a project. I tore down all the casing and got 6 18650. But I want to charge those batteries using the same protection circuit that was inside the casing using laptop battery adapter. Can someone tell me what are the terminal should i connect and how i connect? So far i found using multimeter that P-, P- is negative and P+, P+ is positive and there is no switch. The voltage can be checked directly. The circuit and battery is from Dell 1525.

Question by SaurIMX    |  last reply


Big battery bank project. Circuit related questions?

Hello everyone! I have a project in my mind and I would love some guidance and some ideas if possible. I already have a lot of 18650 batteries in an “acceptable” state (1800-2100mAh each) and I am planning to make a large battery bank, for use in camping mostly (smartphone charging, led bulbs, electrical air pumps 12v, etc) I did read a lot of articles in here about battery banks, but i didn't find something as complex as my idea. I have already made a 12v battery pack with 12x18650, 3 rows in parallel, of 4 in series in each row. My goal was to operate a 12v air pump for inflatable mattresses. It worked like a charm! (Also created with instructions from here! Thanks for that!) But since my “DIY disease” does not leave me in piece… I want to build a large enough pack that can support the following: 1) 12v car plug 2) 5v/1A + 5v/2.1A USB plugs 3) charge circuit for the battery pack, so I will no longer have to remove the batteries to charge them separately 4) switches in each plug 5) led voltmeter also with switch ?) at some point I would like to add a circuit to charge it with a solar charger or a mini wind turbine that i will create at some point with my 3D printer, but for now let stay with the basic stuff! For the case i will use a modified screw organizer case, with those classic 18650 black holders from ebay. (photo below) The case will fit almost 8 to 10 holders (4x18650), so we are talking for 32 to 40 batteries... My main concern is the circuit design. I have done a few simple things in the past, but this is a bit more complicated and that is why I want your guidance/ideas. How to safely connect all those things together or maybe suggest a different plan/design, cable thickness, etc... Links gathered so far: I am thinking about 4S in a row. Is that too much? Or should i consider 3S? 3S Li-ion Charger PCB with BMS For charger... something like this maybe? 12.6V 5A Charger optional... maybe i could fit sothing like that, for laptop charging? 150W DC-DC Boost Converter for 5v 1/2.1Amp charger i m looking at this. 5A Charger Step down Module for usb/12v plugs/voltmeter i am considering this option. Thanks in advance for your time!

Question by the_phantom_boy    |  last reply