The MH-C490F Stealth Two-Hour Compact 4-Bank 9V NiMH Battery Charger is a small (3.25 x 3.15 x 0.85 in. / 8.25 x 8 x 2.15 cm) charger for 1-4 7.2V, 8.4V or 9.6V NiMH rechargeable batteries. It has a Delta-V based microprocessor, which charges batteries to their full potential. The microprocessor automatically switches from rapid charge to trickle charge after the batteries are fully charged to ensure that they maintain their total capacity. Additionally, FLEX pulse charging conditions and enhances battery performance during charging.