I've recently aquired some 18650 and some 17500 lithium ion cells from laptop batteries. I've tested voltages of anywhere from 2.5 to 3.9 volts as they stand (freshly extracted from laptop batteries). I don't yet have a means of chargeing them but I do have a maha 777 II+ on it's way to me. Once it arrives I can give a better idea of how much use is left in these puppies and can let yall know . I am posting this as I will be hoping to trade some of them for 14500 and 10430 lithium ion cells to use in lights. If this sounds interesting to any of you please let me know. Thanks.