USB to AA converter?

Basically, I want to power a small AA device from a usb port, preferably terminating in something that will fit snugly into the two-AA receptacle. I searched the archives, but couldn't find an equivalent project. Any assistance would be appreciated. Thanks.

Topic by J0ub3rt 2 years ago  |  last reply 2 years ago

AA to USB charger

Can someone provide me with a schematic for a AA-5v USB charger, either using 2xAA or 4xAA, using parts available on ebay UK (and no programmable chips), much like the mintyBoost, but the chip isn't available in the UK.

Topic by andy70707 8 years ago  |  last reply 8 years ago

AA Smartphone Charger

Is there a way to charge a Smartphone using a single AA battery? I already have a DC-DC booster to 5V but the current is not enough to charge the phone, can someone please help me with this?

Topic by Wihand 2 years ago  |  last reply 2 years ago

AA battery charger

Hello I have a bunch of AA rechargeable batteries and would like to use them. I could just go out a buy a charger but wheres the fun in that. I would like the charger to be close to the ones you buy, but of course with the instructables finesse. it needs to charge at least 4 at a time and tell me when there charged with an LED indicator. id like to see if it can be plugged into my USB port and charge. Thank You John F.

Topic by jwflammer 7 years ago

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 8 years ago  |  last reply 8 years ago

AA Battery replacement

Hi, So I have a AA battery pack inverter for some EL wire, and I was wondering if it was possible to replace the AA battery's with a lithium Ion battery to reduce its size. What kind of voltage should I look for/do I need to take into account amperage?

Topic by Fozzibehr 5 years ago  |  last reply 5 years ago

replacing AA's with lithium?

 Hey I have a cheap camcorder that runs on AA's but I want to put it on a lithium battery. What I want to use is just the standard battery out of an old phone 3.2v, I'd like to use these because I have a huge surplus of them. I have pretty much no knowledge of electrical circuits and so I need of bit of help. I know two AA's is 3v and any lithium battery is 3.2v, how could I step the battery down to 3v?

Topic by problems 8 years ago  |  last reply 8 years ago

how to make a AA battery for psp? Answered

I cut and stripped the wires of the end bit of the charger and there are 2 wires white and red but i don't know which is positive or negative. also if i use a battery pack that says 3.6v on it but it has 3xAA's inside will it short my psp or blow it up or break it id appreciate the help to anyone who gives it.

Question by 10 years ago  |  last reply 10 years ago

can I use AA battery bank to power an inverter (3000ma 12v)? Answered

Can I use AA battery bank to power an 50w inverter (3000ma 12v)?

Question by celalboz 9 years ago  |  last reply 8 years ago

Solar AA battery charger

Hi i like to build a solar AA battery charger with a indicator that show me it is full, is there a way?

Topic by lSoonl 9 years ago

how to drain a AA battery? Answered

Hi, im doing a science project for school and i need to find what type of AA batteries last the longest (Duracell, Energizer, ect..) but i need to monitor it while it is draining so that i can tell which one goes out first, so a fairly quick technique would be ideal... thanx :)

Question by popcorn4lunch 8 years ago  |  last reply 8 years ago

AAA/AA batery charger? Answered

Hi guys i want to build batery charger for AAA/AA Ni-Mh bateries and im wondering is there any schematics that can help me?  Thaks a lot :)

Question by JohnSmith-Workshop 2 years ago  |  last reply 1 year ago

AA Battery Emulating Transformer?

One of my many hobbies is collecting tabletop water fountains. I have about 6 fountains, two independently powered and 4 that run on 2 AA batteries. Since I have these fountains on all the time, as you can imagine they are costly to power. One day I finally got sick of putting new batteries in these things and rewired their battery wires in a parallel circuit for running on DC power from a wall. Now the only thing I need is a power supply. Now, motors aren't too picky about voltage. They'll operate on different voltages but if it isn't just right the motor will be too loud or too weak to pump the water correctly. This rules out and transformers I have in my bin. Upon measuring the current from the 4 fountains, I found that it uses about 440mA. I have kept my eyes open for a good power supply but have not yet seen one. I've also toyed around with the idea of using the closest one I have (Nokia 3.7v 500~?mA) and applying a voltage regulator on it, but I don't want to buy one yet as I am still a novice at some of the mechanics of most electrical components. Would that be an effective plan? If not, any other ideas? My fountains haven't turned on in a few weeks and there are starting to urge for the sweet trickle of water down their dry, dusty flumes.

Topic by Cabanaman 10 years ago  |  last reply 10 years ago

how to make usb-powered AA battery charger? Answered

I want to make a AA battery charger powered by usb

Question by DELETED_messam 7 years ago  |  last reply 7 years ago

How to make a own 5 X AA battery holder?

Hi guys, I have tried looking around to buy a 5 x AA battery holder but unable to find one. As such, how can I make my own 5 X AA battery holder? I have a 4 x AA holder and a 2 x AA holder.. Is there any way to combine this two and make it a 5 x AA holder? Or can I use a 6 x AA holder and modify it to a 5 x AA holder? Thanks for your inputs.

Topic by kurtselva 6 years ago  |  last reply 6 years ago

How can I safely charge AA batteries with solar? Answered

I am going to build a solar charger, but I am not sure if it is safe to just apply the power from the solar panel, with a blocking diode, to the batteries to charge it.  Will this method hurt the batteries if they are charged for to long.  Could I just open up a regular battery charger and use the components in that? Thanks in advance

Question by JaredsProjects 9 years ago  |  last reply 9 years ago

How to get 5 volts from 4xAA batteries?

Hi all! Whats the best way to get a nice circuit friendly 5 volts from 4xAA batteries? Measuring some brand new AAs, they're about 1.6v when new, which drops under load, I know. So four AAs of course add up to 6.4v, possibly blowing my low current circuit. And isn't a 7805 voltage regulator only good with aroundabouts 7-8 volts source because of how they work? Plus DC-DC converters are expensive, and resistors are wasteful. :-) Thanks!

Question by Heliosphan 8 years ago  |  last reply 6 years ago

Question regarding LEDs and Amperes? Answered

Hi guys,             I want to build a project which has 3 blue leds which will take in almost 9 v. I could just use a 9 volt battery as it would be cheaper and easy but I want more mAh. So I have a few questions regarding if I use 6 AA batteries instead. 1. All of them connected (+ to -) will give me approx. 2500 mah and 9v right? And as 3 LED's would take about 3v 20 mah each, how much run time would 6 AA batteries give me? 2. How much run time would I get with the 9v battery? As it is only 400mah I think Thanks in advance -A Prickly Potato

Question by The Prickly Potato 4 years ago  |  last reply 4 years ago

Psp external battery

I was wondering if anyone knows how to make a external battery pack (via adaptor) and make it so it will run from the battery pack. my concerns are: matching the voltage and mAH. as well as ensuring the safety of my psp i know that i already need the plug for the psp from the ac adaptor, anything else? also if possible, keep it as cheap as possible.

Topic by Dmanthe1 9 years ago  |  last reply 8 years ago

can i use 4 rechargeable aa batteries for a usb charger? Answered

I found a lot of portable usb charger Instructables using a 9v and a 5v regulator and one that used 2 aa with a 5v boost converter. if I'm using it to charge a device that uses a 3.7v li-ion, then wouldn't any voltage above that work, so as long as it's not high enough to damage whatever it's charging? so would putting 4 aa (4.8v) with just a capacitor and diode work as a safe portable usb charger? or does it need to be exactly 5v?

Question by the judge 10 years ago  |  last reply 7 years ago

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 9 years ago  |  last reply 9 years ago

Why is my battery pack melting?

I am new in electronics, and I am building an LED circuit with 2 AA batteries, green LED, and toggle switch. I put the batteries in the circuit (it's a 9v battery clip with a Two AA Battery holder) and it ran for a bit, then the bottom started to melt a bit. It is an older AA holder but the 9v clip is new. Is it because of the old component, switch, voltage, anything!

Question by cboudreaux3 6 years ago  |  last reply 6 years ago

nichrome wire

I got some nichrome wire off eBay, and it works great but when I connected it to a 9 volt battery it barley got hot, then I attached it to 4 x AA batteries and it got red hot. why is this? I don't understand because the 9 volt gives out 9 volts(duh) , but the 4x AA batteries only gives out 6 volts.

Topic by Jordo 11 years ago  |  last reply 11 years ago

What are possible uses for weak batteries? Answered

A followup on my previous question, sort of... I have about 150 old semi used 1.5v AA batteries that don't have enough juice in them anymore to power anything significant. One can only have so many Joule thief powered LEDs, and it's a shame to dispose of them all.  So the question is, what would YOU do (*Pointing at you!*) with those batteries? Thanks for any and all suggestions! P.S. Please provide an instructable if applicable :D

Question by Morgantao 6 years ago  |  last reply 6 years ago

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 7 years ago  |  last reply 7 years ago

This is like having an AA meeting in a bar is! Thoughts?

Topic by Lithium Rain 10 years ago  |  last reply 9 years ago

Charge level indicator for small 4x AA Solar Battery Setup? Answered

Is there a simple way to build a charge indicator for 4 AA NIMH 1.2V 2000 mAh batteries? I thought a small 1-10 volt indicator would do it, but was told it would depend on battery type, etc...

Question by rocktot 6 years ago  |  last reply 6 years ago

Only AA, AAA, C, and D?

Can we only use the types of batteries listed in the Sanyo Eneloop Battery contest's description for the power source in our projects? My 9V clip flashlight technically uses a 9V, but it can also run on 2 AAs. Also, what about N's and the like?

Topic by Radioactive_Legos 10 years ago  |  last reply 10 years ago

Solar panel and battery charging/discharging

Hi, I am trying to power some LED decoration from a small 6v solar panel. However, I would like the LEDs to be also on during the night, so working from batteries during night time. I have connected in parallel 3 x AA batteries (800mAh each) to my solar panel (6v, 500mAh), with a diode in between to avoid the battery discharging to the panel. Voltage is fine, and LEDs are working, but I am not sure if during the day, the solar panel is powering the LEDs and charging the batteries, or if the batteries are discharging all the time. If the solar panel is providing more current than required by the LED, does the excess current go to the AA batteries? Is it harder to charge AA batteries compared to AAA, apart from the capacity (mAh) being higher and therefore taking longer? Do I need more mA to charge AA batteries? Thanks, Seb

Topic by SebastienO 4 years ago  |  last reply 4 years ago

Wondering what I can do with this hollow cathode tube...

I've got this hollow cathode tube from a spectra aa machine (used for metals analysis). It was supposedly still working - my old boss at the lab I worked at found it and considered tossing it out as they no longer had that AA machine (they had upgraded to an ICP/MS), but knows I collect interesting looking things. Am I right to assume that cathode tubes are quite dissimilar to the variety of tubes used in vintage amps and of no use in that regard? Does anyone know what sort of power I'd be looking for to even get this thing to light up? On the plug at the end of its cable, they posts are labeled A through F, then H, J, and K.

Topic by incredibleweirdo 9 years ago  |  last reply 9 years ago

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 8 years ago  |  last reply 8 years ago

how do i make an ac current with a battery? Answered

Hi, i have searched over the internet many a time, looking for how to make pulsating dc or an ac current, however all my results end up with devices which use ac or pulsating dc, which is comming from some homemade ac-dc converter running of mains. now, i am trying to find out how i can use a aa battery to aquire an ac current, or pulsating dc current, preferebly using parts aquirable from a disposale camera. the reason i need ac or pulsating dc is so that i can build a voltage multiplier, and also a tazer. i have tried plasmanas instructable on making a worlds smallest shocker, but it just doesnt work, if you cant get the specific transistors and transformers only aquirable from polaroid brand disposable cameras. plus there are no details on where to buy the parts, or even their details, beyond resistance and capacitance values. the main thing though is that i need to make the pulsating dc or ac from a portable power supply, aka a battery, as i also wish to make a dc-dc boost converter to use on different components within my rc tank. please help, whoever can answer my question best will receive a " best answer"

Question by oldmanbeefjerky 8 years ago  |  last reply 7 years ago

How do I charge 4x AA batteries using USB? Answered

I'm planning an internal laser sight mod for a Maverick Nerf gun, and I've bought a cheap 5v laser module from eBay. I plan to fit a near 5v rechargable battery, or 4x 1.2v AA batteries, but from my understanding of battery chargers, would the USB's 5v be to low to recharge them (The charging voltage seems to be consistently 150% the batteries' output voltage for all my electical devices).

Question by Shadow Of Intent 6 years ago  |  last reply 6 years ago

Will a 5V 300mA USB device run safely off of 3 AA Batteries?

I'm trying to make a 5V 300mA USB device portable, but I don't know how to measure/calculate milliamps for anything. What's the mA on 3AA Batteries? Pretty sure the voltage is 3.5, but please correct me if I'm wrong. Basically: if I chop the USB connector off and wire the device to 3 AA's, will the device operate safely, or will it get damaged?

Question by Azulax 9 years ago  |  last reply 9 years ago

AA vs D battery in my home made disposable camera handheld flash?

I ripped apart a disposable camera, took out the flash board, and with some soldering and some various wires and plastic boxes, tin foil and a cup from laundry detergent... made a handheld flash gun for long exposure... Its cool... Anyway, it takes ONE AA battery. Of course an AA discharges 1.5 volts. A D sized battery also discharges 1.5 volts. Can i use the D battery in the basic setup, since the voltage is the same, to make the flash gun last longer between battery changes? Is there any difference between an AA and a D other than the size and overall capacity? Will this blow the capacitor? Thanks!!!

Question by capeman29 9 years ago  |  last reply 9 years ago

Is it possible to power a device that takes two AA batteries using the power from a USB port?

I have a small fountain that takes two AA batteries.  It looks great sitting on my desk but I'd love to have it powered off of my USB rather than go through AA's all the time.  Is it possible to use the power from a USB port to power the device, and if so, what would need to be built (as far as circuitry to protect the usb ports and get the correct current, etc) to do this? 

Question by pissinguoff247 9 years ago  |  last reply 1 year ago

I've got a NORMAL DS, and I've lost my charger. I wanted to know if anyone hacked the DS to fit AA batteries?

Well my normal battery goes like one hour and then it's over and I've also lost my charger, now I want to know if you can hack a NORMAL ds to fit in AA batteries or something like that.

Question by Miles Tails Prower 9 years ago  |  last reply 8 years ago

Joul thief how to? Answered

I've been reading some ibles about joul thief making, and most of them teach how to power an LED with a 1.5v AA battery.  That is great, if you want to power an LED with a 1.5v AA battery :) But what if I want to keep using old, weak AA batteries, as 1.5v batteries?  How do I make a joul thief that takes whatever the battery can give it, and outputs it as 1.5v?  I know the kind of transistor, ferrite core, number of windings and wire gauge all affect output, so how do I know what to use? Thanks!

Question by Morgantao 6 years ago  |  last reply 6 years ago

Need help finding project? Answered

Hi Guys, I have been searching all over the place (YouTube, Instructables etc.) but I couldn't find my desired project. What I want is a light that is like really bright or long range and CAN BE POWERED BY UPTO 4 AA CELLS. The power is the main problem, I only want to power it with AA cells. So, if anyone could find a project that meets my need I will be really happy. Thanks in advance. -Prickly Potato

Question by SA-DIY 3 years ago  |  last reply 3 years ago

Cell phone battery

My friend gave me an old cell phone, with no battery. (No it does not have service). I don't know if it even works. It is a Motorola i860. Where the battery goes are four pins. How can I connect a AA, or AAA, etc battery to it to see if it works. The first time I tried it, it got real hot and then the battery smelled like it was burning. The second time it sparked. Is it even possible to do this? If it is, I need to know the voltage, polarity, and what pins to use.

Topic by popit 10 years ago  |  last reply 10 years ago

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 1 year ago  |  last reply 1 year ago

Are the AA energizer rechargable batteries NiCd or NiMH? Answered

Question by redlizard5 7 years ago  |  last reply 7 years ago

Is there a durable, waterproof UHF HT that will accept AA batteries?

By waterproof, I of course mean "weather-resistant." I'm looking for an UHF HT that will be just fine if it gets dropped into a lake or falls off an ATV. It doesn't need to float; I can attach a floating keychain to it if necessary. It should also have a AA battery tray that is available from the manufacturer, and still be waterproof with the AA tray. Ideally it would have a keypad. Do you have personal experience with a HT that meets these requirements?

Question by JamesRPatrick 6 years ago  |  last reply 6 years ago

Question about converting a 9v Battery Gadget to AA's.

Hi. I have a Boss DS-2 distortion pedal, but my problem is, it drains the 9 volt batteries like a semi-trailer. So I basically wanted to convert it to AA batteries. Technically speaking, I'll need 6 AA's to make 9volts, but 9 volt batteries have a different current don't they, or will that not matter in this application. I'd also like to insert an on/off switch because it drives me crazy that the only way to remove it, is by pulling out the 'input' cord (guitar to pedal). Please respond if you know the answer.

Topic by Noodle93 11 years ago  |  last reply 11 years ago

Charge 2x AA batteries via USB - Voltage Question? Answered

Hi there,  I guess I didn't pay much attention, especially in some classes when I should have too :) I am DIY-ing a little project, and I need to charge two AA batteries (2450 mAh) via a PCB that get's charged via USB (5V),  here are the specs of the PCB:  Input voltage DC5V Input Current 2A Transmit power 5W Charging voltage 5V Charge Current 500-1000MmA My dilemma is - can I charge (both batteries together) safely with this voltage and current? I looked of course at some "usb aa chargers",but the problem is that i have no space for an extra pcb in the battery department. Thanks a lot if anyone answers, George

Question by grancharov 4 years ago  |  last reply 4 years ago

Using Arduino and 8 servos!? What type of power source? Answered

Hey Arduino guys! I got a question. I am using 8 servos with my Arduino. All the servos are hooked up parallel to the 5v and GND on the Arduino. All the control wires are hooked up on pins 2-9. I'm using 6 AA batteries as my pack. Is this OK for my Arduino? With all these servos moving at once, I want to make sure I'm not frying my board. Oh, and, got another question. The 6 AA batteries are too heavy for my robot spider, so I want to use two 9v batteries instead. But, this delivers 18v. Arduino and only go up to 12v. So, what can I use to bring my 18 volts from two 9v batteries down to 9v or 5v? What can I use? A voltage divider with resistors? A voltage regulator (whatever that is :P)? Thanks guys!

Question by HavocRC 6 years ago  |  last reply 1 year ago

How to charge 4AA NiMH 1,2V 1100mAh in series? Answered

My project is a simple portable stereo box - using old USB powered speakers.I put the speakers with their little amp board in a box where I can put a 3-4NiMH rechargeble batteries 1,2V 1100mAh(in series for ~4-5V) to charge the amp board. I really want to make it so I can just plug an USB (5V) to the box to recharge the batteries when its not used so i dont have to take them out to recharge them with a wall charger everytime.I would like it to have LEDs to tell me when its charging and when its done , or even that it stops charging automatically when the batteries are charged. Im fairly new to electronics so I need the easiest way to do this if possible 

Question by AndrianS 3 years ago  |  last reply 3 years ago


Here is another blinking LED running from a single 1.5 AA battery. While the white and blue LEDs need over 3 volts. The white blinks in the transition moments between red to blue and to red !

Topic by iceng 4 years ago  |  last reply 4 years ago