AA Battery Powered Cell Phone

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Introduction: 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 Comments

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

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 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?

9v would kill the phone, but possibly with resistors i
t could work.

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)

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.

3 AAs with a diode should fix the problem. thats 3.8 volts (approx.)

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.

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.

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