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Battery Terminal Question

Terminals: 1 (+) 2 (?) 3 (-) 4 (?)

I did a search and couldn't get a straight answer. I know on the iPhones/iPods they have 3 wires. +,-, and thermal(so the battery doesn't over heat or over charge or something). Please correct me if I am wrong.

My question is what do terminals 2 and 4 do and can the phone charge/function with just the + and -? When its running off just + and - It wont charge and I get a yellow ! over the battery symbol.

(I am working on a project)
 

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