What are the 3 wires on a lithium ion battery? – Quick-Advices
Its common for a LiPO battery pack to have a tap in between every cell, so 3 wires makes sense for a 2S pack. Assuming the color codes are typical, where black is 0V and the Red is the full output, check with a voltmeter I''ll bet you''ll see about 3.5V between the black and white, and about 7V between the black and red.