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I think the mintyboost is awesome, but at walmart i saw a MusicPower Encore for like $30 bucks and thought it could be much cheaper made from scratch. Basically it is just a lithium battery pack that recharges when pluged into ac and has two usb ports that can power devices from the mains when plugged in or from the battery when not. I think this would make a fantastic instructable; maybe use a cell phone battery(or two) or rechargeable AAs. I can just picture an altoids can hanging from an outlet with a flashing led or something. Also two usb ports would be a great addition to any mintyboost project.

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.

I am looking for some really high capacity aa batterys. I found 4600mah batts on rcdimos.com.... I thought that these looked a bit sketchy. Does anyone know some high capacity aa rechargeables??

I have two drills with weak batterys ,craftsman 14.4 and dewalt 14.4. are there any sudjestions to get them to work better?

Hello, My burning question is if I can recharge a car battery with a 12 v 5 Amps DC energy source. The car battery is a 12v 70 A standard battery, i think it uses Lead. I am asking because i do not have any experience in recharging car batteries and i know that mobile phone batteries can explode if you do somenthing wrong, so i want to get it right the first time with a car battery. Thanks.

 I am tyring to make my led hoop- what i am trying to do is hook up a rechargeable battery that I can hook the wire straight from the hoop to the wall. what do I do and how? I have been trying to figure this out and just can't figure it out! can anyone help me? 

Im looking for a dc motor that will carry a load of three 24v 100a alternators and a suggestion of what size and type of batteries will carry the dc motor. NOTE one of the three alternators purposes is to recharge the batteries powering the motor. Please help with a suggestion of what type of motor to get, the voltage or hp of the motor and what size battiers will be suitable to carry that motor.Thank you

I had this idea a while back and have yet to see one made. Unfortunately I don't have the means to try it myself. What I thought was a wireless mouse which would be recharged with its own dongle. When the dongle is plugged into the computer the batteries inside would be charged up then when it is put into the mouse for storage those batteries would charge up the mouse. I don't really know a whole lot about electronics - despite perusing instructables now and then ;) - so I don't know if this is even possible. But I don't see why it couldn't be done, or why it hasn't been done yet {unless I just haven't found it}. Peace to you and yours, Matthew "Dra'Gon" Stohler

I took apart 2 cordless drill batteries and there were 13 cells in each one, which were Ni-Cd 1.2 volts each. Also there were the numbers C DE35ND on them if that helps at all. I cut 3 off in order to form a 12v battery (it was originally 15.6v) but I dont know how I can safely charge it. I no longer have the charger that went with the drill, but I was wondering if I can just use a wall adaptor to charge them or do I need a better charger? All comments and answers are greatly appreciated!!!

For efficiency has anyone tried the ZipLinq X2 model universal charger coupled to the Gomadic retractable cord with tip #37 for the Creative Zen V+. It seemed like a nice setup except it doesn't work.I also tried to use it for my Motorola Pebl and Razr with tip #28. No Joy. Wish someone would try and comment. GomadicZiplinq

I am making a lamp cordless using batteries and low poer 12v led strip. My question is can i somehow connect a solar cell so as the light hits it recharges the rechargables batteries that will actually power the lamp. So I dont have to take batteries out and recharge them every few days or week? 

Can you recharge rechargeable batteries with a normal battery clip like you buy at radio shack? (batteries will be charged via solar charging circuit)

Hi there, i have a query. In a circuit powering just an LED can the battery power the LED an recharge itself? Or, having a battery power an electric motor connected to electric motor running it in reverse could that generate electricity to run the first electric motor? In my head i have this image in my head that the 2 motors wired together with a LED could power that LED and themselves from the battery connected for a short while then put back in its package? I'm not blessed with access to a reasonably priced electronics store (honestly, its cheaper for me to import the components from America paying postage to New Zealand than purchasing at the nearest store even through online or phone order) Anyway, so i haven't got the patience to wait 2weeks and spend many dollars to experiment myself i wondered if anyone had or knows if this sort of thing works? Thank you Also, could you explain and list what i would need to do this? Thanks again

Hello Everyone! I am planning to make a rear bike light, which has rechargeable batteries through USB. I then decided to use Lithium Ion Batteries for it. But the problem is that I dont know what parts I need. It should be able to light up 4 COB LEDs (Each rated 12V, photo given) Till now, after looking at several other instructables, I am able to say that: 1. It needs a steup transformer from 5V TO 12 V - TP4056 (https://www.amazon.in/TP4056-lithium-Battery-Charging-Charger/dp/B00JQ2VG1A/ref=sr_1_8?ie=UTF8&qid;=1505148914&sr;=8-8&keywords;=lithiumion+batteries)  or https://www.adafruit.com/product/259 2. It needs some sort of protection like:  http://www.batteryspace.com/PCB-for-11.1V-Li-Ion-Battery-Pack-4.0A-limit-----PCM-L03S04-559.aspx 3. Also do can I allign three 3.7V Lithium Ion Batteries to make 11.1V? Please help me out Thanks!

Hi i was wondering if there was any electrically reversible battery chemistries that can be made from around the house materials like copper wire, iron nails, galvanized nails, graphite rods, aluminum foil, and other items like those.

If i must using 17.5volt solar panel to charging battery 12v 72ah, what should need to apply between both of the item?

So I'm thinking of a few projects using rechargeable batteries and I wanted to try something. I want to have a power cord attached to the project that can plug in to a standard AC socket to recharge the batteries. I have no experience with rechargeable batteries beyond putting them into the box and sticking it in the wall. I want to be able to hook up 6 AA rechargeables and have no idea what DC voltage I should be using. I have an old charger for a two way radio that runs at 9V and was designed to charge the 4 AAA batteries inside. Would this work? It would be nice because it's small and even has an LED to indicate the charging status. Is this possible and is there anything other than DC voltage I need to worry about? Also, is it safe to hook that up as long as there's a switch to disconnect the batteries from the project? Any help is appreciated!

Hi I am new to rechargeable cells.For my application, I need 2 Li-ion cells (LIR2032) in parallel to increase the capacity. I am using NCP1835B charger IC . Can I use the same IC to charge them while they are in parallel. Is there any extra protection circuitry to be used? What happens if the 2 cells are at different voltages initially ?Will the trickle current bring one of the cells to proper voltage while not affecting the other one?

I have a project that I have been working on, and it currently runs on two different battery packs for different components. I want to put rechargeable batteries in these packs, and I want to install a wall charger to charge the batteries.  I am having trouble finding a good tutorial on the circuitry of this.  Will I need two different chargers for the two components, or can I charge both from the same power supply?  Can anyone help me out? I can post some photos of the project and its current circuitry if needed, its a laser spirograph. 

I have a laptop battery that was cracked, so i opened it up, and like any other, it had individual NIMH batteries strung together... how to i find out how much voltage the individual batteries can take? I want to make my own battery pack with several of these laptop batteries... battery pack is GP B905 NIMH 12 volt thanks

This hoop is assembled using ProdMod instructions and materials. It's rechargeable, collapsible, stays lit up to 6 hours, is quiet, durable and contains 21 leds - 7 blue, 7 green and 7 slow or fast color changing lights. All hoops are soldered for optimum durability. 40" diameter.Charges in about an hour!Charger is small and compact just like your cell phone charger. Weighs only 5 oz. Easy to carry in your purse or travel bag. Only one simple wire to connect to your hoop. An easy to read indicator light tells when its charged. Charge at any time, no need to wait for the lights to die out.Custom colors and sizes also available. Inquire. http://www.hoopelements.com/shoppe/sled/index.html or http://hoopelements.etsy.com.

I've come up with a plan to make a potable mobile charger for my galaxy phone with a rechargeable 9 volts battery.My original mobile charger(220 VAC input) says it gives an output of 5VDC at 0.7 amperes and hence I decided to make it with the given ratings.So here's my plan-I'll use a 7805 to regulate the 9VDC from the battery to 5VDC.The 7805 gives a maximum of 1 A output.So here's my question should I use a current regulator(LM317) to limit the current from exceeding 0.7 amps or will the phone's battery draw the sufficient amps from the LM7805?Maybe it might be a good idea to assist the output with a resistor as a safety measure.So,what do you say?

Storing electricity in homemade rechargeable battery ... I've read lots of things about cranking the shaft of a conventional motor to create electricity. Can the electricity be stored for later use in a homemade rechargeable battery? Also, does anyone have an idea on how to make such a rechargeable battery? Thanks.

I have a Filter Stream Ultra Dust Tamer 4500 that doesn't recharge.  Is there a solution; a replacement part; any help at all?  I really don't understand rechargeable batteries.  I think they may get fried if the transformer is left plugged in too long??  How long is too long?  I know this question applies to all rechargeable batteries with transformers, e.g., cell phones, portable vacuum cleaners, cameras and on and on.  Thank you.

, any ideas on how i can make this unit rechargeable? and by that i mean to where u plug a cord into the unit and it charges the internal battery for the battery is not removable in the unit so its kind of same idea as charging your cell phone. below is a drawing of the unit.

Greetings all, I'm in need of a hack to replace the lead acid battery in a rechargeable halogen spotlight purchased at a local store. The spotlight came with a AC recharger but 15 charge time hours returns only approximately twenty minutes of usable light. I'd much like to replace the power source with something of a longer duration than the current one third of an hour. As much interested in simply rewiring the device to work from my car's AC outlet if possible. Mind I only have a few dollars invested in this device still I'd like to see if a replacement power source is worth the effort. Thanks to all who reply.http://ledmuseum.candlepower.us/third/fixit.htm

I'm  looking to build a battery-powered speaker system for use on job sites, that will need to be louder than the equipment being used. For this purpose, I plan on using a tripath amp and some pretty decent speakers I have lying around, but the tough part is power. I need between 12V and 13.6V, with a relatively high AH rating. I considered a car battery, but don't want to have to trickle charge. I considered a Power Wheels battery and charger, but I've been seeing bad reviews on lifespan Any thoughts?

Hi guys, I am using a lot 9v volt batteries so I thought why don't I buy rechargeable but I found out that the charges where expensive. so does anyone know a circuit to make a charger?

Is it possible to overcharge a rechargeable battery? If so, how, and how can you prevent it?

I'm in need of a way to recharge a capacitor ( or more ). The disposable cameras circut is trashed ( it didn't work even before then w/ the right setup ), and I can't afford another. Is there some way to avoid the circut in favor of a more direct route? I need to recharge it for use as a shocker or coil gun, and have an AA battery holder as my power source as well as a switch to fire. Please help.

I want to use a rechargeable battery in a circuit, but I'm having trouble understanding it. Let's say I want two switches... One to use an alkaline to charge a rechargeable battery, and another to power an LED using that charged battery... can some draw the absolute SIMPLEST way to do that using a AA battery and this battery:http://www.coolight.com/LIR2032-Rechargeable-Coin-Cell-Battery-3-6v-p/1xlir2032.htm(The LED works fine with 3.6V)Remember, I'm very dumb, don't assume I know ANYTHING!Thanks!

New here and I have a question. I was building a NES MP3 player and everything is going fine until I got to the battery part. At the moment, it current uses normal nonrechargable AAA battery to power it but I was wondering if it's even possible to put in a rechargable battery in there and wire it up to the USB port so that plugging it into the USB will recharge the battery? If so, how do I do it? Thanks in advance

I am going to build a solar powered USB/ Ipod Charger and I have a questions pertaining to it. A solar cell will charge 4 AA rechargeable batteries (NiMH) in a battery holder and these batteries will power a device through a Minty Boost. Now, I have little experience with creating electronics. So I was wondering if I can connect the solar cell directly to the battery holder (with a diode of course) or do I need to connect it to another component and then to the battery holder. Thanks.

I got my little sister these little rc cars made by tomy. they have infrared to avoid obstacles and navigate themselves (pretty cool) but they burn through batteries very quick. it uses 2 x AA non rechargeable batteries so i want to make them rechargeable. Here is my problems with current ideas, and the pictures really help explain everything so please look there. 1 normal rechargeable batteries --- will have to remove battery door every time and it is too much hassle 2 use rechargeable battery pack for wii like below -- not as common and expensive 3 heres the one that might work incorporate a 3v rechargeable power source with a dc charger port and 2 indicator leds, all in an enclosed 2 x AA battery holder HOW??? please help --- i just want to make it work out but i really dont care if i have to change the batteries or anything like that also, i need to make 2 of these so cheap please!!! and maybe add another led for the car to have a glow like pic 4? thanks rak

I am building a portable boombox and trying to figure out how to integrate a 12v battery into it that can be recharged using a input jack and the AC adapter charger that came with the battery., without having to disconnect the load.   Is it as simple as connecting both the charger and the load to the battery?  Would I need to wire in a switch to disconnect the load when I plug in the charger?  I'm an electronics noob so any help would be appreciated.  Thanks.

I want to use a rechargeable battery inside a toy, and I don't want to remove the battery for charging.  I'm looking for a simple and safe method for charging that a young child can do by themself.  Here are some thoughts I've had: wireless (such as with a qi pad) = Is there any way to actually keep this from getting hot?  I'm assuming the base would be always on, and the toy would be left on it all night or longer. solar = This requires a light or the sun to charge.  I'm considering putting the solar cell in the bottom of the toy and making a light base that it could be placed on, but I'd need some type of sensor or switch so it only lights when the toy is on it. metal contact pads = This would be easier than a plug since you'd only need to set the toy down, but can it be done safely?   Anybody have suggestions?  Thanks.

Hi, I'm trying to figure out how to recharge these BATTERIES without having them blow up in my face. I'm very new to making my own electronics and a little timid when it comes to messing with batteries. I believe i need to use this DC jack connector? With this CHARGER? I'm using the battery to power 21 LEDS wired in parallel with resistors (3.4v 20mA) if relevant. I think i need to wire it up like in the picture. I guess my question is if i wire all these things together and try to charge the battery will it destroy something? Also if i wired two of these batteries in parallel can I still charge it the same way? How do i know i'm using the right DC jack connector and charger? Is there a specific switch i need to use? Any help would be greatly appreciated!!! Thanks!

(I know it wouldn't work very well but lets just say that it does) does the positive part of the regular battery go to the positive part of the rechargeable battery? I am trying to recharge a battery and i don't want to ruin the rechargeable battery so i just wanted to make sure that i was going in the right direction...

How do I install a rechargeable battery into a boombox or device that can be charged via ac adapter? I'm building a boombox and want to have an internal power supply that can be recharged via  the ac adapter that comes with the battery.  I want to be able to charge it without having to remove the battery.   I'm guessing I need to wire in some sort of switch that switches between power mode and charging mode,  but I really have no idea how to go about it or where to find the relevant information on how to do it.  I'm an electronics noob so any input would be appreciated.  Thanks

Just wondering if anyone knows whether it is would be possible to charge 10 AA rechargeable battery's in series with a standard 12v solar panel without any specialist kit ? Thanks

I recently made one of the Altoids box USB chargers that have been popping up all over the site and it turned out great, but now I'm looking for a little more of a challenge, so for my next endeavor I'd like to make a portable USB charger which uses rechargeable batteries that can be recharged while still in USB charger through a micro USB input (like how you plug in a phone to charge the internal battery).  I've seen a few projects that use solar panels to achieve a similar result but (perhaps just due to my own limited knowledge) I couldn't figure out how to make it work with a micro USB port. Also, if possible, I'd love to be able to use the 18650 (EFest IMR) as the rechargeable battery/batteries.  I have a few of them that I use for e-cigarette mods and they hold a good amount of juice so why spend more money on rechargeable batteries when I already have some.  But if using more conventional batteries would make things easier then that's not a problem at all. I can't wait to hear the community's input on this.  And to those who are the knowledgeable ones in this field, don't feel obligated to say everything entirely in layman terms for my benefit  - what I don't know I will look up; how else are we supposed to learn new things anyway?  Thank you for your time and for any help you can offer! -John

I got 2 questions1st. i was shopping at target today and noticed that the big energizer rechargeable "D" size batteries has the same mAh rating as the smaller "AA" rechargeable energizers i have at home (2500 mAh) can any one explain this?2nd. i've seen some pics around the site of custom "D" sized "AA" battery holders that hold 4 "AA's" in a "D" sized space ( https://www.instructables.com/id/SA59T0CFB11L31B/ ), but i haven't seen any instructions on how to make them. can some one make an instructable about this? (preferably one that can be made to hook up the" AA's" in parallel)

Anyone thing this kind of thing can be done?http://crave.cnet.co.uk/greentech/0,250000598,49301285,00.htmim not sure if flexible solar panels are avaliable

I was wondering if anyone has or will post an instructable showing how to build a self-contained solar/rechargeable blinking LED (or LEDs)  I have a telephone pole I would like to have illuminated for oncoming traffic.  Reflective tape isn't cutting it.  I was thinking a LED strip that blinked would be a better "notice" to drivers. It would have to be self-contained and powered given the location, hence the solar/rechargeable aspect.  It would also have to turn on at dusk and off at dawn. (off when light out, on when dark, so a photo switch needed) Any ideas how this can be done?  I was thinking hacking a solar powered yard light to power a LED strip but I have no idea how the electronic parts work or if the charge is enough to do so.  I am sure there are parts in one of those lights that I can use.  Harbor Freight is my buddy. Any help appreciated.

Hello all:  Absolute electronic noob here looking for advice.  Thank you all in advance for your input.  What I am trying to make is a small inexpensive rechargeable device that will take small various objects back and for at variable speeds all controlled via Bluetooth.  “Android/IOS.  I would like to keep the device no larger than 6 to 8 inches but, if necessary can go larger.  I am hoping I can control the speed as well as the distance the objects travel via Bluetooth. As far as direction I would like a set back and forth stop point.  At this point the entire project is in my head.  I apologize for my electronic ignorance.  Again Thank You.

I am currently working on a project that requires a battery that's capable of being charged while at the same time give off an even smaller amount of energy. Any and all details to either obtain something like this or even make one would be greatly appreciated.

Hello all!I'm just completing a LED hula hoop. I was hoping to eventually retrofit it to add a detachable solar recharging circuit.What I'm wondering is: What's the best way to splice the recharging circuit into the already existing LED circuit? The current setup is two batteries in series, connected to 9 LEDs and resistors in parallel. The batteries and LEDs are separated by a switch. It's loosely based on this ible:https://www.instructables.com/id/LED-Hula-Hoop/I plan to add the capability to plug the hulahoop into a solar recharger box during the day so it can glow all night long! I'd like to set it up so there is a small recharging 'port', near the batteries, that can be plugged into the recharging box.Any ideas or tips?