Nickel Metal units use environmentally friendly Panasonic cells. Unlike Nickel Cadmium, Nickel Metal Hydride chemistry never suffers any form of "memory!" . This version includes the NMH-ATM 10-hour charger. The completely automatic MCU-controlled smart charger features battery self diagnosis and auto voltage detection, has LED indicators and a universal 120-240volt input. Compatible with all 12v and 14.4v NMH models. Charge rate: .9 amp.