Feature: Duracell - Ion Speed 1000 Battery Charger with 4 AA Batteries - charger for AA and AAA batteries 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