A lithium ion battery is a competitively used type of cell that exhibits a different kind of charging potential variant from other cells. When powering the device, the electrons are discharged from the negative to the positive terminals unlike when it is being powered where the ions migrate in the reverse direction. This power build up enables it to conserve power for long periods. This is partly due to the diode-like action of the two terminals, which strike a balance in situations of extra power accumulation. This extra voltage, which is more than the energy potential of the device but whose polarity is supportable, is first discharged during use. This overload if read in a meter, would reveal that the device has registered negative polarity which when charging a phone it first loses before turning back to full capacity. Get more info here https://www.lithiumbatterychina.com/ |