This Duracell Ion Speed 1000 NiMH Battery Charger will recharge your batteries in 4 to 8 hours (To approx. 90% of full charge when using 1300mAh up to 2500mAh 2xAA NiMH Batteries) 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 or 400 charges, whichever comes first.