The Duracell Ion Speed 1000 NiMH Battery Charger will recharge your batteries in 4-8 hours* with 1000 mW** of charging power. It recharges any AA and AAA NiMH battery from any brand. You can recharge 2 or 4 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.*** *To approx. 90% of full charge when using 1300mAh up to 2500mAh 4xAA NiMH Batteries (included). **Based on charging AA batteries. ***Or 400 recharges, whichever comes first., ION SPEED BATTERY CHARGER: The Duracell Ion Speed 1000 NiMH Battery Charger will recharge your batteries in 4-8 hours* with 1000 mW** of charging power., CHARGES IN 4-8 HOURS: With 1000 mW** charge power, Duracell Ion Speed Battery recharges batteries in 4 to 8 hours., AUTO SHUTOFF: Duracell Ion Speed Battery Charger has an Auto Shutoff feature, so you won’t use any unnecessary electricity., MULTI-BATTERY CHARGE POWER: Recharge 2 or 4 batteries at a single time with the Duracell Ion Speed Battery Charger, INCLUDES 4 AA BATTERIES: Battery Charger comes with 4 Double A Duracell Rechargeable batteries.