I received two 18500 cells in the mail today from a Chinese seller (I happen to be in China) and one cell charges fine (using a li-ion HG-103W charger), but the other retains no charge. The seller said I need to try to use the cell to "activate it" but it wouldn't even light up an LED. It reads under 1V in the meter. Whenever I try to charge it, the charge light is instantly green, meaning the cell is not taking any charge (or appears full to the charger). Is there any way to revive this cell or is it a dud?