The ultimate family battery power station. Charges up to (8) AA, (8) AAA, (4) C, (4) D, or (1) 9V Nickel Metal Hydride (NiMH) rechargeable batteries. Super safe - will only begin charging when the lid is closed. Charge time - 3 to 7 hours depending on battery size. Easy-to-read LCD screen shows the charging status of the batteries inside. ENERGY STAR certified.