AA Battery Powered Cell Phone

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Intro: AA Battery Powered Cell Phone

Has the battery in your cell phone died forever? Try this to extend your phone's life time.

Step 1: What You'll Need

See picture...

You'll also need a cell phone that takes a battery of 3-3.7 volts.

Step 2: The Battery Case

If your battery case has wires on it already, skip this step.

Use the needle nosed pliers to hold the wires while you strip a small amount of the jacket off of the wire. Then solder the wire onto each of the contacts on the case.

Step 3: Find the Polarity of the Battery and Test Your Phone.

Find what terminals on the phone are positive and what ones are negitive. the phone may not say it, but the battery is legally required to state the polarity.

Step 4: Test It

Use the jumper cables to hook up the phone to the batteries and test to make sure your phone works.

Step 5: Put It Together

Solder the wires from the aa holder onto the contacts, then cut a hole in the battery cover for the wire to come out of the case, then hot glue the battery holder to back to the cover.

BE SURE TO GET THE POLARITY RIGHT, you may want to put some hot glue over the contacts to prevent shorting.

(note, if the phone works, but the batteries are hot, you need to add another set in parallel, i had to)

Step 6: Your Done+ More Pix

After doing several tests and calculations, I have concluded that 2700mAh Ni-Cd rechargeables give roughly four times the battery life than the 880mAh standard battery.


WARNING: AFTER MAKING THIS MOD; DO NOT PLUG YOUR PHONE INTO THE CHARGER

I AM NOT RESPONSIBLE FOR ANY DAMAGE TO YOUR PHONE!

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    73 Discussions

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    Lima79

    11 months ago

    so I can even use the below battery or any, yes. Thanks bro, great help.

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    reddog92396

    8 years ago on Introduction

     My RAZR works okay on two AA batteries. It runs and I can type etc. but I don't think I can make calls and I can't use the internet should I jump up to a 9V battery?

    5 replies
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    patt39reddog92396

    Reply 8 years ago on Introduction

    I think four AA's will burn your phone, As they provided 6 volts but the phone needs 3.6 volts. Maybe 3 of rechargeable 1.2 volts battery would work (they provided the exactly 3.6 volts you need)

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    alexandermpatt39

    Reply 7 years ago on Introduction

    Not exactly accurate. Depends on how it's wired (series vs parallel).
    @reddog92396 - If you make another set of 2 batteries, wired exactly like the first set of 2, then wire those 2 sets in parallel, rather than series, you will retain the same ~3V, but double your amperage. But, that may not solve your problem (read on)

    While i have no intention of offending or disparaging the author, the following should address many of the issues other people seem to be having, as well as a glaring failure on the author's part to include obligatory and necessary information:
    It's very important to accurately provide the needed voltage, which is usually NOT going to be a direct multiple of 1.5V. Additionally, you must provide the necessary amperage (somewhat blindly addressed by the author). Most cell phones will have the ability to handle slight over-voltages (note: i said: SLIGHT); they do this with resistors on the power inputs. These resistors can only handle small over-voltages, because they are SMD (physically small, thus, electrical capacity is small). You'll need to stack your batteries (AA, AAA, C, D, whatever) in such a way as to provide a voltage slightly over the listed battery voltage, then use a resistor to drop it back down to the exact required voltage. This assumes you are using alkaline batteries... Rechargeable batteries behave a little differently as they discharge, and rarely get above their listed voltage, thus, a slight difference in voltage will likely not create a problem. i'm not going to give you the values for the resistors, because there are already online tools for that, and there's no way i'd be able to provide the exact values for every single cell phone and battery combination. For those that are having amperage issues (it turns on, but you can't call): add more batteries in parallel, NOT series. This will boost your available power without changing your voltage.

    I got some AAA rechargeables, now to find a batt holder. They don't stick out as much as AA's so it would be easy on my pockets.

    3 replies

    BTW, they are 850 mAh each. I'll use 3 and that will be 3.6v with 2550mAh. I'm also trying to devise a plan to use possibly 2 and make a step up circuit to reduce weight.

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    The energy capacity is measured in watt hours. Each of your AAA's would carry 1020 mWh and 3 of the AAA's would carry 3060 mWh. You won't get 3.6 V at 2550mAh but rather 3.6 V at 850 mAh or you will calculate it to be 9180 mWh

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    Cekpi7hflipper

    Reply 6 years ago on Introduction

    its wrong if they connected parallel than it will be 1.2v and 2550 mAh but if they are connected serial then it will be 3.6v and 850 mAh

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    Jack_666

    8 years ago on Introduction

    I like your project but would be better to buy another battery for cell phone so do not ruin our phone get on with your initiative forgives the mistakes of language is because I am Latino and I do not speak very well English

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    threewheela

    8 years ago on Introduction

     I tried this whith an old lg c2000 phone i had and all it would do is turn on for a second and turn back off. I used two brand new AAs giving me 3v and the original battery voltage is 3.7v . The phone still works when i put the original battery back in, somebody tell me what i did wrong!

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    xevious

    8 years ago on Introduction

    A useful instructable to know if you've lost your charger and need to use your phone.  However, there are risks involved.  Not all phones have the same battery voltage.  Using two AA batteries might overload the phone and damage it.  I'd try this only on a backup phone.

    In any case, as a permanent solution it's kind of ridiculous to be carrying around a phone 3 times as thick as it normally is.  You're better off just buying a new aftermarket battery.

    This discussion seems pretty old, but I have two Nokia phones. I use a Nokia 2610 (was a Gophone but I threw in my postpaid SIM) and the stock battery lasts about 5 days to 8 days. My mother had a Nokia 6102i that broke, but still charges batteries. I took that off her hands and now I use that to charge my battery while I swap them out. I haven't plugged in my 2610 since I got it, so that works out fine. The 6102i sits on the charger with a battery for days on end, till my battery runs out on the 2610. Good plan, but it'll be bad when the 6102i's charging circuit poops and the battery explodes.

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    Spectrace

    10 years ago on Introduction

    Do you charge your phone overnight? I have the same exact phone (mines the red one though) and i took it to a Verizon store last week and told them that the battery doesn't last long. (i actually took it for another problem but told them about the battery too) the lady opened up the cover and saw that the battery was "swollen" and asked if i charge it overnight. I said yes, and she said that that was the problem. Motorolas dont have a "STOP CHARGING" function built into the phone that tells it to stop charging when its full so the constant stream of power messes up the battery.

    3 replies
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    Kention3Spectrace

    Reply 10 years ago on Introduction

    I charge mine over night too but how are you supposed to know when to take it off the charger? conclusion: Motorola Sucks!

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    tanmanknexKention3

    Reply 9 years ago on Introduction

    NOT true, i have had two motorola phones, the c650, and the razr v3. i have charged them both for DAYS on end without harm. the c650 is about 7 years old and it works fine, even with being left on the charger for a whole month!!!

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    SpectraceKention3

    Reply 10 years ago on Introduction

    oh i guess i forgot to say this: The person said that it should only be charged 3-4 hours a day. and yes motorola does suck. thats why i'm planning on getting the LG Dare. (LG phones are pwn)