Energizer Universal Battery Charger Energizer Family Battery Charger is designed to charge NiMH batteries and has a built-in safety timer that prevents over-charging of batteries. It can charge 8 AA, 8 AAA, 4 C, 4 D batteries and one 9 V battery in 3 to 6 hours. Visual charge status which indicates whether the battery is fully charged or still charging Keeps your batteries going, and going, and going Recharges batteries so you can save on power costs Trickle charge technology maintains batteries at full capacity