battery in cell phones and games?

blakcpelt

New member
i looked at some cell phone battery's and my PSP battery's i saw that they all have 3 prongs i know witch are + and - but what is the 3 one for. and is there a way that i can recharge them if i don't have the charger. the reason that i want to use these batteries is that button cell battery's are 3V and expensive and last for only so long till need replacement. if i can you use rechargeable battery like ones in cell phones witch have around 3.4-4V. this could save money and would fit easy in my LED powered gear.
 
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