Lithium battery cost and discharge only 400-600 periods, specially modified products and solutions, but 800 periods. The nickel-metal hydride rechargeable battery can attain more than seven hundred periods, some excellent quality products and solutions as many as 1200 periods cost and discharge, this sort of a comparison, the nickel-metal hydride batteries stay more time than lithium batteries. In addition, the value of nickel-metal hydride batteries is much lessen than the lithium batteries. Moreover, strictly speaking, lithium batteries hold the same memory result, but its memory result may be very lower, primarily negligible.