Every once in a while you get the problem of your cell phone running out of batteries just when you haven't got a charger at hand.

This afternoon it happened to me,.... Damn empty battery and no charger for miles... At least that I know of.

So what do you do ? Build your own, in,.... 1 minute.

Step 1: Find the Pinout of Your Phone

This instructable will only work with some phones, because you can't imitate the most plugs that are used to charger mobile phones, but with my Sony Ericsson it works fine because of the way the phone is charged.

To find the pinout of your phone, you could use Google, or use ( the one I used, with help of google Pinouts ). Hit Ctrl + F and go look for you phone pinout. If you can't find it, you'll have a problem and won't be able to continue, but you usually will.

My phone has a 'standard ?' Sony Ericsson plug so it was easy to find. I used the image below, disgarding the Datacable part,... which it think can be pretty usefull :).
or put the battery in a fridge for a few minutes... that will buy you some talktime too
I think you need to warm it, not cool it. Who can build this thing in a minute!??
Warming batteries decreaces their "life-time" but cooling their "standby-time"
whats mcgyver?
a guy on an old 90's tv show. he can make/do anything with common hose hold matearials. like once, he fixed a crack in a tank of sulfuric acid with choclate.
Mcgyver was a guy on a tv show that could make anything out of what he had. Like he could make an airplane out of anything he could get his hands on.
If you're in a bind and only need a minute or two, try rubbing the battery with your hands until it's relatively warm. A woman I told this to actually used that hint in an emergency and was able to call her daughter. Not an instructable, but a helpful hint.
Project in the background is a 8x8 led display with a PIC 16F628. There was no risk of blowing up the phone ( i hope ). Because de original charger isn't current limited, so that has to be inside the phone. And since the 770mAh battery is normally charged in ±1 hour, It uses about 1A. So without an coolblock usually an 7805 won't be able to give the current and burn out.
Cool, you are lucky that the voltage regulator is smoked, and not your phone. (Bolletje Pepernoten! van AH! Stomme Nederlander :P)
That project in the background looks like a bunch of flash circuit capacitors wired up, I am working on a similar project myself
Cool, now if I could just wire it up to use a longer lasting battery...

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