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:;=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

Best rechargeable AA? Answered

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

Question by astroboy907   |  last reply

weak rechargable battery

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

Topic by michaelsr.   |  last reply

LED HOOP- rechargeable

 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? 

Question by nickiepip   |  last reply

How to recharge these batteries?

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!!!

Question by Electronics Man   |  last reply

Recharge rechargeable battery with a led battery powered lamp?

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? 

Question by jjb82177   |  last reply

Let's just say i want to recharge a rechargeable battery with another AA battery... Answered

(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...

Question by ML159   |  last reply

Can a "dead" rechargeable battery be resucitated?

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.

Question by randithedog   |  last reply

How do I install a rechargeable battery into a boombox or device that can be charged via ac adapter?

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

Question by banjopoker 

Can you recharge rechargeable batteries with a normal battery clip?? Answered

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

Question by monkhm   |  last reply

Can a battery recharge itself? Answered

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

Question by Scotty3000   |  last reply

DIY Rechargeable Cell Chemistry?

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.

Question by LiquidLightning   |  last reply

12v trickle charging rechargeable AA battery's?

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

Question by _TEAP0T_   |  last reply

solar panel and rechargeable battery

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

Question by fboll   |  last reply

Rechargeable Battery Pack Install

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. 

Topic by ugman77   |  last reply

Rechargable NIMH Batteries Question

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

Topic by Hurdy Gurdy Man   |  last reply

How to Charge Rechargeable Batteries Via a Micro USB Port in a Portable USB Charger

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

Topic by nettles4349   |  last reply

I am trying to find and/or make a battery that can be charged while giving off a charge. and ideas?? Answered

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.

Question by Magnet_Dude   |  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

Hack Needed: Rechargeable Halogen Spotlight

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.

Topic by patron_zero   |  last reply

Is it possible to make a battery powered comb that is also a flatiron?

For marketing class, we have to design a product and packaging. It has to be something that could be an actual product, although we DO NOT have to create a functioning prototype. I would like to design a comb that, when you turn it on, is also a flatiron and is powered by a rechargeable battery. My teacher doesn't think a battery could heat it hot enough. I want to the comb heat to at least 400 degrees Fahrenheit. Is it possibly for a rechargeable battery to heat a device that high? Thank you!

Question by creativemariar   |  last reply

Battery recommendation

Hello, I'm looking for a rechargeable battery for a project and I'm not having any luck finding a suitable one.  Here's what I need: The battery will need to be between 12 - 18v with between 1-2 amp.  This will be powering a set of speakers, so not really sure what type of amp hours I need.  The battery will need to fit into a tin lunch box.   An idea I had was to use a 12 or 18v battery for Power Tools - not sure if it will work though.  I also found this, not sure if it is powerful enough though. Any thoughts/ideas is appreciated.  

Topic by RabidNoodle   |  last reply

Rechargeable CR2 (3v) Battery Pack for a Digital Harinezumi camera?

I've been burning through CR2 batteries while using my Harinezumi camera. I would like to make a battery pack that wires into battery compartment, makes a connection with the terminals and keeps it juiced as long as the pack can juice it.   Ideally, I'd like to have the battery pack in my pocket with a wire going to the camera through a small hole drilled in the battery compartment door. I have about 10 rechargeable CR2 batteries with these specs... Rechargeable 3V CR2 800mAh which I've been using to power the camera just fine,,, just not long enough. How would I go about making a battery pack to give the correct current/power to the camera without causing any harm (frying it)?  Should I use and combine the batteries I already have , or should I make a battery pack with different, bigger, batteries? Once I figure this out, I'll post the complete instructable on here with photos of my project. Thanks!!!

Question by eldrizno   |  last reply

Instructions and parts list to create a USB port rechargeable battery powered LED string?

Hi folks.  I work at a place called "The Running Room" up here in Canada and am looking to help out the local running folks with being more visible in the accursed winter darkness.  While we encourage reflective running gear, LEDs are a nice accent and would help with safety.  I don't mind picking up parts off Ebay and am OK with soldering and such but I am not an electrical engineer so any instructions and parts would have to be pretty basic.  My apologies for the questions to follow and thanks in advance for any assistance you can offer.  I don't mind if you want to "turbo charge" a killer rig, but I would need the final construct to be able to be worn comfortably and run for a few hours before being easily recharged via a USB port. Thanks, Joseph

Question by floating_weasel   |  last reply

How to charge a rechargeable 9v battery?

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?

Question by bobbiy   |  last reply

Solar LED 2835 strip with rechargeable battery, controller and night sensor?

 Needing help with a solar set up to recharge and power a small led strip with 2835 LEDs. I need a small strip of bright LEDs to light up a address block during the night and it is in a rock column.  I want the set up to be as visually minimal as possible.  My plan is to have a solar panel charging a battery during the day, have the sensor turn the light on at dusk and off at dawn.  I have a reel of 2835 LEDs and I want to cut a 1 Ft length of them and mount below the address block to illuminate it.  I already have all the mounting details set and how I plan on running the wires.  I will put the battery, controller and dimmer in a box on the back of the column and close it off and run the wires through the mortar to the LED strip which will be sitting on a rock shelf.  The solar panel will be mounted on the top of the column which is almost totally flat.  My questions and assistance needed is on the design of the solar components, battery, controller, wiring, design and if it I have it all correct and it will work.  I have done hours of research on the net and think I have an understanding of this, but would like one you electronic wizards to proof my concept and provide any input on things I might need to add, change or improvements to make it better or more cost effective.  I also searched previous forum questions and didn't see anything exactly like this. Pic is attached on my general layout, but here is what I have come up with so far: -12v 10w Solar panel, $20 -Charge Controller, $6 -20a Fuse, $0 -12v 5ah battery, $16 -LED dimming controller, $6 -12v Photocell, $3 -2835 LED 1 foot strip (cut from reel), $0 --I can provide links and further details to the components if needed, but they are all standard items that you can get on ebay or amazon Total cost not including box housing is approx. $51   (seems like there should already be something like this available much cheaper, but I have searched a lot and can't find anything.  I don't want one of those bulky solar LED lights and I want something that will stay on for at least 8 hours at night) I did the research and 1 ft of the 2835 leds uses about 4 watts.  Looking at all the formulas I found and the battery I intend to buy, 5ah, I calculated it would run the LEDs for 14 hours.   4/12 = .34   * 1000 = 340    Battery is 5000mah so  5000 / 340 = 14.7 hrs Does this sound correct? Next was determining the solar panel required. I came up with the 10w panel to have enough to charge the battery.   10w / 12v = .83    battery again is 5ah, so 5 / .83 = roughly 6 hours Is this correct also? The other items are components to complete the circuit, protect the battery and controller and have the ability to dim the lights if they are too bright. I'm hoping I researched enough and did correct calculations and didn't miss anything. But please provide input, thoughts and anything I might have missed.

Question by Ti6   |  last reply

4 pins with unknown polarity, i want to charge a battery with it?

So I have 4 pins with unknown polarity, and a rechargeable battery with 2 pin with known polarity, and i got a multimeter. How am i going to solve this? I randomly did something and it worked, but it did not charge, but it could use the battery, but now its empty it cant anymore. layout used is --++ please help :)

Question by lhu   |  last reply

What is the easiest way to recharge a capacitor? Answered

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.

Question by StartedBullet   |  last reply

How to charge rechargeable batteries for a project? Answered

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.

Question by dom13marco   |  last reply

easy recharging method for child's toy

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.

Topic by aliasjanedoe   |  last reply

Wall charger for rechargeable batteries HELP!

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!

Topic by kasmir   |  last reply

can you charge lets say 8 maybe 12 AA rechargeable batteries using the ouput from a rechargeable toothbrush ?

Is the power that normally charges the small batteries of an electric toothbrush strong enough to charge 8 to 12 AA ?

Question by vince086   |  last reply

How do regular rechargeable batteries do in cold temperatures?

How would regular 1.2V rechargeable batteries do in extreme cold temperatures like -40, even if they were receiving a charge in that temperature? They would be kept in an air tight container. Thanks in advance.

Topic by horsebones   |  last reply

can i use 4 AAA rechargeable batterys for my usb altoids charger without capacitors or anything?

I want to build altoids usb phone charger. i have 2 options using 9v battery and 5v voltage regulator, or using 4 AAA rechargeable batterys without anything expect female USB . So can i build 4 x AAA usb charger and what else i need ( diode, capacitor,....)?

Question by tealk   |  last reply

Led Problem? Answered

I hooked up 12 3mm red leds in parallel and then powered them with 2x 1.5v rechargeable batteries, and it worked, until 2 blew 3 got damaged and they all started flickering. Why, and what should I do to fix it? Feel free to ask any questions. Thanks Big   

Question by alexw2150   |  last reply

What are polyacene batteries? Answered

Hi, I've recently come across these batteries that say "Polyacene Battery". I looked at the rating, and it's stated in Farads. I went on Wikipedia but it didn't show up, however the search results had one entry, "supercapacitors". So are these supercapacitors or batteries? I do however know they are rechargeable. PS The link to where i found these is

Question by LiquidLightning   |  last reply

How many volts and amps would i need to charge 10x 1.2v 1800mAh Ni-MH batteries at the same time?

So i have a battery pack of 10 rechargeable batteries (1.2v 1800mAh) and i was wondering how many amps and volts I need to charge them all at the same time. Instead of having to take out like 2 at a time to charge them. Is it possible to charge them all at the same time? Thanks for any answers!

Question by Alberto64   |  last reply

Can you use an alternator on an axle to recharge batteries? Answered

If you have a battery powered vehicle of some sort, can you put an alternator/generator or something on the axles to generate electricity to recharge the batteries the vehicle runs on? When the axle turns, the brushes pass over the coil generating electricity which is then routed back to the batteries thereby recharging the batteries. Please pardon the bad Paint drawing, but something like this.

Question by Zippomanonfire   |  last reply

Would this idea to prolong battery life work? (NOT perpetual motion, just extended life!) Answered

A few days ago, I designed a self-charging battery system using a dc motor attached to a rechargeable battery pack that turns a generator via gears, similar to how a car battery works, converting kinetic energy from the motor to electrical energy with the generator and looping back to the battery. I've modified the idea to reduce friction as much as I can so that the motor and generator are directly attached now, keeping energy from being lost to friction between gears. Here's a crappy diagram:    |-----|--------------|                     |--------------|-----|    |       |  Motor       |-------||-------|Generator|      |    | | ---|--------------|                     |--------------|---| |    | |------------|----------------|------------------------| |    |--------------|  Battery      |--------------------------|                       |----------------| I know that 100% efficiency is impossible, I'm not trying to get all the energy back, and I'm not trying to create energy. I'm trying to loop the energy that isn't lost to friction and other factors back to the battery, hypothetically charging the battery up a little to somewhat extend the life. I realize that it will eventually go dead no matter what I do due to the laws of thermodynamics. What I want to know if this would increase the battery life enough to be worth incorporating in a design. (I know the motors should be attached to the battery by two different ends but its actually supposed to be a rechargeable battery pack so one motor is attached to input in to charge the battery and the other is output so the battery powers it. Plus if I tried to draw the wires like that it would've taken forever.)

Question by ALogan97   |  last reply

How to make a battery charger?

So I was just wondering, what basic guid lines do you have to follow when making a battery charger for say a lithium-ion battery? How many volts do I need to supply to it? Do I need any protection diodes? How would I keep it from charging to fast, or trying to charge the charger? Thanks!

Question by HavocRC   |  last reply

What kind of 12v battery do I need?

I've got one of these:;=UTF8&qid;=1296352335&sr;=1-1 A Pyramid 150 watt audio amplifier, hooked up to a pair of Pyle 5.25" 140 watt speakers. I'd like to get a 12v battery to run it it for a few hours, but I don't know what kind of amp hours I'm going to need. Any ideas? I'd use a car battery, but I want to be able to fit the whole she-bang into an ammo can. Also looking at making a fiberglass backpack speaker enclosure for snowboarding / biking, and I want to try and keep the weight down. I don't know if I can use a 12v cordless drill battery pack, or if I should try sealed lead acid batteries.

Topic by samlynn79 

Can I charge 3x1.2V rechargeable batteries serial connected with 5.5V solar panel?

Can I charge 3x1.2V rechargeable batteries serial connected with 5.5V solar panel(70mA, 0.39W)?

Question by dava_2   |  last reply

Solar Powered Rechargable Battery Charger Wiring?

I have a 16v/1.2 Amp (output) solar panel that I want to power a 12-16v/800mA (input) rechargable battery charger. Do I need to add a AGC 800mA in-line fuse or? Should the fuse holder be 32v or? Any suggestions?

Question by xploregon   |  last reply

what button cells can you recharge?/ super capacitor help

What button cells can you recharge? For example, some are in calculators wtih solar panels, do they need a complex charging circuit? I'm building a bunch of tiny circuits and I don't want to keep on changing the battery. edit, I now need help with super capacitors

Topic by guyfrom7up   |  last reply

converting a 6v rechargeable halogen spotlight so it can use a standard CFL bulb. is this a stupid question?

  i have a 1 million candle power spotlight form home depot ($10) it has a 6v 1200mAh battery in it.  I want to make the rechargable light able to use low powered CFL bulbs.  can it be done?  Anyone know?   Thank yall 

Question by firemount   |  last reply

How can I convert a rechargeable beard trimmer to strictly a/c?

First of all, I love this trimmer. I've had it for probabaly 15 years. The settings are so precise and I'm so used to it that I would hate to replace it. It is a rechargeable model, which plugs into a cord, not a charging stand. The battery hasn't charged in probabaly 10 years. But since it stopped charging, I was able to keep using it by having it plugged in. I was able to do this for a long time until several days ago. When I'd turn it on while plugged into the outlet, the motor would barely even run. So I took it apart, looked around, and figured I would try to replace the rechargeable battery inside. I sourced a battery, installed it, and the trimmer worked again. I charged it overnight and went to use it the next morning. I got about halfway through when it just completely died on me. So I would turn it off for a few minutes, let it maybe charge a little and try to finish my trimming. At this point, I could maybe get 30 seconds of really weak performance before it would grind to a halt. I tried plugging it in and using it that way, as I had done so many times before, but that wouldn't work either. Can anyone advise me as to what's going on here? Why was I able to use it for so many years with the a/c/ cord and a dead battery, but now with a fresh battery, the a/c cord is useless for operation and obviously useless for charging as well? So I'm wondering if there might be a way to convert this trimmer to strictly a/c, remove the battery from the eqation, and operate it that way? I'm no electronics guru, by any means. But If instructed, I'm sure I could get this thing operational again. I don't care about it being battery powered anyway. I use it in the bathroom where there are a couple of very handy outlets. Thanks.

Question by chinaski   |  last reply