Ready in 4 hours* (Approx. 90% of full charge, when using Duracell 1300 mAh AA NiMH batteries; Approx. 80% of full charge when using Duracell 750 mAh AAA NiMH batteries) Duracell Hi-Speed Charger charges 4 AA rechargeable batteries in 4 hours* When LEDs start flashing green, batteries can be used for up to 4 hours (When charging AA batteries; results may vary by device and usage patterns) Comes with 2 AA 1300 mAh and 2 AAA 750 mAh Duracell rechargeable batteries included Charges both AA and AAA batteries Hi-Speed Charger comes with Duracell’s 5-year guarantee (Approx. 90% of full charge, when using Duracell 1300 mAh AA NiMH batteries; Approx. 80% of full charge when using Duracell 750 mAh AAA NiMH batteries).