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Possible Duplicate:
Why we have 3 pins on some batteries?

I'm trying to build (DIY) open charger for mobile battery. I would like to know what is the usage the middle one?

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Is there anyway I could check the status of battery (i.e., charged to max)?

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palaniraja
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    Duplicate of [http://electronics.stackexchange.com/questions/10588/why-we-have-3-pins-on-some-batteries](http://electronics.stackexchange.com/questions/10588/why-we-have-3-pins-on-some-batteries) ? – MikeJ-UK Mar 07 '12 at 15:49

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