The summary of this question is:
I have a LG Optimus One (P500). For sometime I am wondering why my phone's battery has four terminals.
I don't think this question is related to Android at all. Even my 7 years old Motorola phone running Java based OS has similar battery.
This question is similar to this question and looks like its going to be closed any moment.
Why hasn't the question been closed but rather received so many up-votes?