Lithium battery cost and discharge only 400-600 occasions, specially changed goods, but 800 occasions. The nickel-metal hydride rechargeable battery can get to far more than 700 occasions, some very good excellent goods around 1200 occasions cost and discharge, such a comparison, the nickel-metal hydride batteries live for a longer time than lithium batteries. Additionally, the worth of nickel-metal hydride batteries is far decreased than the lithium batteries. Additionally, strictly speaking, lithium batteries have the same memory impact, but its memory impact is quite decreased, generally negligible.