Batteries?

What are the best batteries for an electric motorcycle, and for a car too. Or can someone explain how to read the batteries specs (like amps, watts,volts) for the best suited for your ev project?

Topic by Lego man   |  last reply


Battery power

I am attempting to calculate my amp need for my garage in order to set up a 12v battery system. Using the formula; Watts / voltage = amps drawn, I have hit a question. If using a 12v battery system and converting to 110v, should I be using 12v or 110v in the formula?Example; 100 watt light bulb / 110 volts = .91 amps. Nice!But if I use the 12v; 100watt light / 12v = 8.3 amps.I'm believing I would be drawing 8.3 amps from the battery to power this light.Plus the converter draw...Please tell me which is correct?

Topic by olddawg   |  last reply


Battery charger help

As some of you may already know, I'm planning on building an electric car this summer. Its all planned out, but instead of using regular transformer based chargers I was wondering if someone could help me design a transistor based charger to reduce weight. Requirements 48 or 72 volts Needs to charge marine deep cycle batteries over night Needs to not have a transformer. Needs to be relatively small (under 1 cubic foot) Needs to be simple enough for me to build myself (I can do it if you can design it) Can anyone give me some links or some good schematics for this? Thanks

Topic by LinuxH4x0r   |  last reply


keeping batteries warm?

We have 12v batteries to support our solar power.  our problem is keeping them warm when we are not at home.  does anyone have any suggestions?  we are often gone for work for 3 - 5 weeks, so we can't do wood or waste oil, and days without sun wont help our batteries.  this year it is very cold, night time wind chills below -10

Question by mag1213   |  last reply


Recycling Alkaline Batteries

It has always bothered me when I disposed of spent alkaline batteries ( having 3 children , can add up to a lot of batteries per year).And there are no local or state programs for recycling these types of batteries where I live. I recently found a company that recycles all types of batteries and electronic waste by mail @ a reasonable cost. They also offer a municipal program for your town.http://www.batteryrecycling.com/new+iRecycle+kitscheck it out , it`s worth the 5 minutes that it`ll take you.

Topic by dolabil66   |  last reply


Led to battery pack?

Hi, I just bought a led (5mm) Infared and a battery pack but when i try to test the led it dont work? either i am doing it wrong or something i dont know lol....

Topic by JustinM4   |  last reply


GOLF CART BATTERY AGE

HOW CAN I DETERMINE AGE OF A 6V OR 8V GOLF CART BATTERY?  K8 IS STAMPED ON ONE OF THE TERMINALS.  THANK YOU

Question by herbt   |  last reply


Wind powered battery charger

HI.. this is my first post on these forums. I want to build a small windmill that will charge ordinary rechargeable AA sized batteries. however there's a problem. I have hooked up my windmill to a motor which produces DC current. Now, the motor provides enough and MORE current to charge the batteries. My problem is how do i protect the battery from overly high voltages and currents that may be generated by the motor?

Topic by mahela007   |  last reply


Exercise bike into a battery generator ?

Hi I was wondering if anyone had any plans on turning an exercise bike into a generator to power batteries, or something along those lines. Any ideas or plans would be helpful. I wanted to make a mini power plant in my garage while working out. Thought it would be cool to power some lights or something. Thank you for your time!

Question by lshoop91   |  last reply


Laptop batteries re-use

Hello all Instructables users (who read the forums anyway) I'm hoping to get an old laptop with a broken hard drive and @ sign on the keyboard. My plan is to turn this into a media pc, running off AC continuously (when needed, obviously, not all the time). Plug in a new hard drive, a tv and (possibly wireless) keyboard with trackball (and use an old android phone as controller too, maybe - a side project), and install geexbox, and there we go... But, this leaves an old laptop battery, which AFAIK holds a perfectly suitable charge, with nothing to do. Having just got an ebook reader, and being someone who enjoys a quiet read sometimes, I would quite like to use this battery to power a light so that I can read with as little impact to the environment as possible - I reckon a laptop battery would last a fair while with a few high power LED's. I'd also like to leave it in it's original packaging so that I can recharge it fairly easily. Is this a pointless pipe dream? Is this dangerous, as it's a Li-Po battery? Can I canvas for thoughts? TIA Steve

Topic by sbabstock   |  last reply


External batteries for hotglue gun

I was wondering if I could mount batteries on top of a glue gun. I cut the wire of the cord and i had two minicords and i ran those out of a hole i made in the top of the gluegun. any ideas on what batteries, a switch on/off method? and also how to connect the wires to the batteries would be extremely appreciated.

Topic by ledzep567   |  last reply



Why is it so hard to find lithium ion rechargeable AA, AAA, or other standard battery sizes in lithium ion? Answered

No real details here just though it would be nice to get standard battery sizes in lithium ion rechargeable instead of nimh.

Question by robbtoberfest   |  last reply


Can you overcharge a rechargeable battery?

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

Question by phalanx447   |  last reply


can i power a household fan with some sort of battery pack? Answered

I am working on a portable air conditioner for my house when in order to make it portable i would need to power with a battery pack of some sort.

Question by kmccarthy666   |  last reply


shows battery AND at the bottom of battery its shaded in and has lig bolt throygh it!

Have a 30 gb ipod wont power up when charger is plugged in it it shows a battery waith a bolt through it.. PLEASE HELP thanks me email Chrismorganohs@aol.com

Question by 1983morgan   |  last reply


How to use a WALKMAN without batteries?

Hello everybody. I have a simply question... ¿its possible to use my WALKMAN without batteries, and use it with a battery like the cellphones has, so i can charge my WALKMAN and use it wihout buying batteries? Please let me know thanks!!

Topic by PatricioTissone   |  last reply



Heating for outside battery storage compartment.

I have an idea for a wind powered outside LED light for the family's cabin. It would be on a pole and illuminate the pathway, just like a street light would do. So I wanted to have a battery in a box with my wind turbine charging the battery through the day and night. The problem is, it gets really cold sometimes like -36F / -38C and that would kill the battery. So, I also wanted to include some really small, simple heater inside the box. I'm having problems finding anything on what would be the best way to go about this. Wikipedia says heaters are made by resisting current. Are there special types of resisters you add to your DC current to create heat? Thoughts, suggestions, feedback are all welcome. Thanks.

Topic by horsebones   |  last reply


Sloar powered fans with battery charger.?

I am looking for a solution to a small problem I have a solar powered fan details are Current: (isC) 300mA Output: 2V Motor-current: 20mA to 100mA Motor-voltage: 1V to 3V I would like to have a solar panel charging the batteries & running the fan during sunny daylight hours & double AA or triple AAA bateries running it after dark. Any easy solution please. Thanks

Question by Oslove   |  last reply


lightup 11w or 15w CFL from a 12v DC 32ah battery ?

Is there any way to lightup 11w or 15W CFL from a 12v DC 32ah battery ? if yes, can u provide me the circuit diagram ? (I want to lightup 3 cfl bulbs for home use.. ) Thanks

Question by    |  last reply


how do i use a savonius wind turbine made from 200w electric scooter motor to charge 12v sla battery?

 the turbine is to charge a battery the battery will the run 2 12v caravan lights in a hut in the woods I am not electronically minded so you need to put the answer into laymans terms please many thanks 

Question by venator   |  last reply


How do I select the proper diode for my solar panel battery charger? Answered

I have a solar panel that puts out 3V at 40 mA. I have seen the Instructables on the site and read them all, and while they explain why you need a diode, they do not tell how they decided on which one to use. What goes into this? I would like to know how to calculate these things for myself.

Question by phalanx447   |  last reply


Math help needed for converting volts/watts in solar

Here's what I know: Watts (P) = Amps (I) x Volts (E). What I don't know is if I have a solar panel that is rated at 12v, 0.125 mW I can do the above equation to get that my amps are 0.01. Does that sound right? My real Q, is what is the best power battery to store this energy? Should I only use 8 "D" cells? Could I use a 12 v motorcycle battery? If I use Ni-Cd batteries, is the fact that the batteries are rated at 2500 ma make any difference? Is there a website where I can get a good feel for what batteries are good for what type of activity, solar cells, etc? thanx, sam

Topic by wanzie   |  last reply


How can I use my rechargeable drill gun battery as a power source for LED's?

I would like to repeatedly power a series of LED's with a rechargeable drill/screw gun battery. Is there a way to rewire an old battery charger so that in becomes the power-input for the battery?

Question by Mr. Rookey MacHinest 


Looking for a LED curcuit that will tell me when my AA batteries are charged using solar cells?

All the DIY solar chargers seem to use a feel test or a multi meter to test if batteries are charged. Is there a curcuit utilizing an LED like those on manufactured chargers, that will let me know when my batteries are charged, and possibly put them in float mode or turn the unit off?

Question by heyfeaver   |  last reply


what size of batttery can be charge with a 43w solar panel? can i connct it with out charge controler to battery&invert Answered

What size of batttery can be charge with a 43w solar panel? can i connct it with out charge controler to battery&invert

Question by    |  last reply


Back-up power

Hey there folks! Looking for some advise again. NH just went through the worst power outage in years (maybe history). 6 days without power has me thinking again. I have means of heat (wood stove) and means of cooking (propane) and lighting (candles and my LED projects), but the well pump is a problem. The need of water to flush the toilets came from the stream nearby, all well and good as it was, washing our bodies from buckets has to go. I have learned that my 220vac well pump actually draws it's power from 2 110 vac circuits. If I have this right (which is my first question, is this even possible) I only need a 110vac converter to run this off my batteries. Now, if I'm correct here (second question) a 4amp 220vac pump is 880 watts, then the draw from the 12vdc battery should be 74amps (give a few for losses maybe 80 amps). I only have 2 160AH deep cell batteries running currently. Am I looking at a reality of 2 hrs (half the draw) or 4 hrs use (full draw)? Or, is it even less.... Yup, that was a third question! I just bought a 2500 (5000 max) watt inverter intended for the shop and thought I would use this as my back-up for the winter. Am i even close here?

Topic by olddawg   |  last reply


How do I dispose of batteries the green way???

I've always heard that batteries are really bad to put in a landfill... But I was wondering how/where to throw them away or recycle them.

Question by mac100   |  last reply


I want to power a 4W 30V lamp with a battery that charges by a dynamo/hand crank generator.How can I do this?

I want to power a 4W 30V lamp with a battery that charges by a dynamo/hand crank generator. For batteries, I want to use something like 3.7 V standard phone batteries, or may be camera batteries etc. I understand that I have to use a few phone batteries to get a decent amount of voltage which I can then step up to 30V to power my lamp. How can I go about doing this? How would you suggest to connect the batteries, and what kind of circuitry (buck/boost regulator, voltage step up, RC circuit etc. ) between the battery and lamp do you think is the best to use for outputting the right voltage? Thanks a bunch! :)

Question by IvyP   |  last reply


can this battery operated water pump be used in a toy sink??

My children have a toy sink with a recirculating pump that runs on 4 D batteries. We paid 59.00 for the sink, the kids loved it but the pump went in three days. Checking online I see that this is a big problem with this toy but my kids love it. Will this work on a toy?

Question by    |  last reply


Need help with electrical math and set up for Solar Power Battery Charger

Hey I am thinking of making a mini solar panel battery pack/charger I need help figuring out how to set it all up! This is what I have: -Mini Solar Panel, believe it is 10v  -9.7v 700mAh Ni-Cd battery pack -Female USB slot How to set it up? -I want to have the solar panel charge the battery -Insert a LED indicator for batter, Charging/Charged -I want the USB female to be outputting battery power (for any USB device i.e. cell phone, ipod, etc.) -I am guessing I will need/want some sort of regulator between the panel and battery and one between the battery and the USB output? Any help on set up and pieces needed would be much appreciated!  Thanks

Topic by rpvanpatt   |  last reply



Help designing solar roof for a van

So i plan on collecting a crap load of those little solar yard lights, taking out the solar panels till i have enough to cover the roof of my van. But from there i dont know where to go and i dont have much experience with making electronics, it would be nice to have them charge a battery or something, not sure. ideas, comments or plans would be greatly appreciated. j

Topic by deth2all   |  last reply


"Tribute" Gone for good, the Incandescent Globe.

I would first start with I am completely pro Fluoro even more-so LeD.Yet I must say I did shed a tear for my friend the Incandescent.Good times, good times.Any one else have some humourous/memorable occasions involving the Incandescent?If you do, you may be interested in my lastest 5 min project involving an Incandesent and a LeD fit-out...And here comes the Incan 'ible's.... ;)Goodhart~ care to share your under car fuel drama again? :)

Topic by Lftndbt   |  last reply



Old Makita Drill

I have an old cordless Makita drill the water guy left at our house 15 years ago, I found in my shed with the charger :-). The battery is pretty much completely dead, and I don't want to buy a new $40 one or zap it with a welder. How can I turn it into a Corded drill or use a different battery with it? It is the kind that stores the battery in the handle. 9.6V Battery.

Topic by Yerboogieman   |  last reply



Why doesn't my windmill generator seem to charge the batteries?

Hi there, I figured Id post here because I have no one to ask and answers aren't obvious from googling. The connection is as follows: - (0 Volts to 40 Volts open voltage) Windmill to a 12 Volt Battery. - (0 Volts to 20 Volts open voltage) Solar Panel to a 12 Volt Battery. A solar panel has an open voltage @ 19.95 Vdc and delivering 0 amps.  The panel is not connected.   Then I connect the panel to the 12 Volt Battery.  Now, the solar panel now shows a voltage of 14 V and delivering 2 amps into the battery. That makes sense to me.  When connecting the solar panel to the battery, the system is now "on load", so the voltage drops.  But because the voltage drops, the amperage is being sent into the battery. ---- Now,  The windmill has an open voltage between 0 and 40 vdc.  On average it shows 20 volts when spinning. 40 volts when its faster.  Its known that it takes 14.1 volts to start charging a battery.   So, now lets assume the windmill is spinning @ 40 volts open voltage.   I connect the windmill to the battery.  For under a second, I see amperage go from the windmill to the battery.   The amperage amount is 3 amps for 1/4 a second, 0.6 2/4 of a second, then eventually 0. The voltage after connecting the windmill to the battery is the same as the battery voltage.  In my eyes, its not charging the battery, because amperage dropped to 0. As a side note, as soon as I connect the windmill to the battery, the generator/turbine, also slows down in speed.   I am also curious to know why it is slowing down as well.   Anyone have any ideas? - U

Question by useful1   |  last reply


Single LED, single battery module for inserting in a small wood sculpture?

I'd like to find a source for a self-contained LED unit with battery and switch for inserting into a carved (turned, actually) mushroom. An AAA battery would almost be too large but would be ok for lack of anything else. Something cheap, with a pushbutton switch on the bottom, that would fit in the stem of the mushroom. Any leads would be appreciated, thanks!

Topic by kenearlg   |  last reply


Is this lion battery bank expensive? 150AH @12-14v

I was thinking about how much would cost making a lion battery bank with enough amps/hours to feed a car audio system (stereo + sub amp). Since this setup would drain around 25-30AH I definitely want a battery bank with around 150 AH capacity to get at least around 4 hours of music at max potency. Woulds this be so expensive? I know that lion batteries are getting cheaper and cheaper, but any idea about how much would this cost? I have made a research on ebay and amazon, I could not get an average idea, and considering many brands lie about the specs, I better first ask here to hopefully get some references. Thanks.

Topic by johanx4   |  last reply


LED THROWIES - can AG 13 batteries be used?

Thowie instructions say 3 volt CR2032 batteries - I was told AG 13 would work.  We are using throwies made with soft white LED 's to put in white paper lanterns for a wedding.  We want to "light" the lanterns the day before, so need them to burn well for at least 36 hours.  Any suggestions or help is appreciated!

Question by juspla   |  last reply


What's the best way to put kinetic energy in batteries? Answered

I had the idea to have the kids at my favorite summer camp group to "pump" their own electricity because one of the more primitive camps in that group already pumps their own water, but doesn't use electricity. What's the best way to put kinetic energy in batteries? When i say best i mean highest mechanical advantage.   The ways i can think of are: -shaking a magnet through a coil of wires -spinning a wheel to shake  "          " -pedaling to spin the wheel to "       '' -using a lawn mower sort of wheel. Also to refresh my memory what are the other ways (with a higher mechanical advantage) to move a magnet with coils to generate electricity?

Question by Houdinipeter   |  last reply


is there a way to lower a transformers power from 25 volts to charge a 19.2 volt drill battery?

I got a 19.2 volt battery tool kit without the charger,and i have a 25 volt 2 amp transformer (110 volt input) im not using and i want to use it to charge the batterys if its possible. ive read online that 2 amps is not a problem but it needs to be the same volts and i have no idea how to knock off  5 or 6 volts i would apreciate any help.

Question by    |  last reply


Black & Decker 18 LED Area Light Question? Answered

I have a Black & Decker 18 LED Area Light, it needs six "AA" batteries can i just use a 9v battery?

Question by cheating-master   |  last reply


Is there an easy way to run a computer/laptop, almost directly from a car battery? Has anyone got some good ideas?

This one has had us stumped for a while. I'm currently thinking along the lines of side-stepping the transformer.

Question by dyln   |  last reply


How do I make a solar charger for 8 NiMH batteries?

I want to use solar power to charge batteries to use to charge electronic devices (phone, ipod,etc.), and put it in a backpack.  Is there any way to modify a regular AC NiMH charger to safely charge the batteries?  Or do I have to make my own?  Also what do I have to do to regulate the final power coming form the batteries to charge the device safely.  I know that there are instructables on this, but some contradict the others and most don't include all of the things that I need in one instructable. Thanks in advance

Question by JaredsProjects   |  last reply


How do I hookup 1 solar panel to trickle charge my 2 connected RV batteries?

I want to trickle charge my RV batteries (which are connected to each other) using one solar panel. If I hook it up to one of the batteries will that cause an imbalance in the charge between them? Or since they are connected, will it even out? Or do I need to connect it to both of them individually? Do I need to connect a charge controller between the battery/batteries and solar panel or will the built-in charge controller in the RV suffice? The solar panel does have a built-in blocking diode. I'm trying to learn all I can about solar power -- hope you can help me.

Question by arnold54   |  last reply


Creating Multi Source power to store in batteries and convert for home use

 I am planning on using multi source electricity producers to store in batteries and convert to 110/220 AC for home use. I am going to set up as many generators as I can, including solar panels, wind generators, water flow generators and heat flow generators. I am building an underground storage room for the batteries. What would be the best batteries to use? What do I need to be able to use my generators to charge the batteries (I am thinking I will need a separate battery charger for each battery, but what do I need between the generators and the chargers?) and then how do I convert the DC to AC and hook it up to the house? As I will be doing this a little at a time, we will be using electricity from the power company at the same time. As we save money on the electric bill with the power we supply, we will expand our own generation of power, until we no longer need to buy electricity. Thank you in advance, Michael C. LaMay

Topic by MichaelL255   |  last reply


12v solar panel/battery setup project- NOT lead/acid

Hi, I have a project that I'm trying to design/build and could use some help/advice with some of the electrical theory. I feel like this should be really simple but I'm having a lot of issues. I have done a lot of googling but can't seem to find applicable answers so I started my own thread. Any help will be greatly appreciated! If I can solve this, I will be happy to write up a detailed instructable so that others can use this information as well.  The short version: Trying to build a lightweight solar panel>battery pack>UHF radio charging setup. Nominal voltage is all 12v. I'm having difficulty regulating amperage between the units. The long version: My friend is in charge of a campsite which needs to have a 2-way radio on at all times. They need to be able to charge these radios on-premise because they are out there for a little over a week at a time. A solar panel seems ideal for this application. The whole charging setup needs to be lightweight since it is a >10 mile hike into the campsite. Ideally, I would like to use an array of NiMH AA batteries because they are small, relatively cheap, and can be replaced easily if there is an issue. I am also under the impression that they handle repetitive charge/discharge cycles well. I am not married to that though so if there is a compelling reason to use lipo or something else, I am open to that. The radio: is a Motorola Radius CP200. The wall charger that comes with it outputs 14v at 1.5 amps. The battery in the radio (according to the sticker on it) is 7.4v 16.21Wh lithium ion. Setup 1 that I've been trying: I have a 12v solar panel charging a pack of AA NiMH batteries. I started with an 8-pack holder but moved up to a 10-pack to increase voltage and total mAH a little. I've been using little voltage regulators in between the solar panel and the batteries as well as between the batteries and the radio. These function as diodes and help me get the correct charging voltage. My problem is that I can't regulate the amperage. The battery pack will pull as much as it can from the solar panel, and the radio will pull as much as it can from the battery pack. What ends up happening is when I first plug the radio into the battery pack, it works fine. But after a couple minutes, the amperage skyrockets to like 3 or 4 or more amps. The voltage regulator hits some sort of thermal protection limit and the whole thing shuts down. I tried throwing this amperage regulator in there as well to keep it below 1.5 amps, naively thinking that it would just affect the amperage and not the voltage. But what happens is when it's in constant amps mode, it just cuts the voltage to compensate and keeps the total power the same. Setup 2 that I've been trying: I thought maybe since I was having issues with the 'smarts' of these batteries charging and discharging, I would switch over to USB battery packs since they have a lot of built-in protection circuitry. I got this solar charger, an older version of this battery pack, and used the same voltage regulators to step up the voltage from 5v to 14v to charge the radio. I get the same issue of high-amperage discharging of the battery pack. I tried using this step-up converter between the battery pack and the radio but it doesn't seem to work or maybe I'm not using it correctly (I can't seem to get the adjustment pots to actually do anything...). It seems like I'm thinking about current wrong or something. Any suggestions or insight into what's wrong with my approaches would be super helpful. If anyone has any suggestions for radically changing my approach, I'm open to those as well. Thanks for reading!

Topic by Cking0987   |  last reply