The Duracell® ION SPEED™ 1000 Advanced NiMH battery charger will recharge your batteries in four to eight hours with 1000 mW of charging power. It recharges any AA and AAA NiMH battery from any brand. You can recharge two or four batteries at a time, and with an LED Charge Status Indicator, you'll know when charging is complete. It also features an Auto Shutoff so you won't use any unnecessary electricity. Plus, the Duracell® Rechargeable Pre-Charged NiMH Batteries are guaranteed to last 10 years. Battery Type: NiMH; Battery Size: AA; AAA; Charge Time: 4 to 8 h.