RECHARGE YOUR BATTERIES IN 4 TO 8 HOURS with 4000 mW of charging power using the Duracell Ion Speed 1000 Battery Charger, based on charging AA batteries to approximately 90% of full charge, when using Duracell 1300 mAh or up to 2500mAh 2xAA NiMH batteries YOU CAN RECHARGE 2 OR 4 AA AND AAA NIMH BATTERIES from any brand at a time, and with auto shut-off and an LED Charge Status Indicator, you’ll know when charging is complete POWERFUL NiMH BATTERIES work in any NiMH charger; you can recharge them up to 400 times, helping save you money PRE-CHARGED AND READY TO USE – Guaranteed to last for 10 years or 400 recharges, whichever comes first; Duracell Rechargeable batteries will hold a charge for up to 1 year when not in use LONG-LASTING CHARGE – You can get hundreds of charging cycles out of each Duracell Rechargeable battery #1 TRUSTED BATTERY BRAND – From storm season to medical needs to the holidays, Duracell is the #1 trusted battery brand; Duracell Rechargeable batteries are available in Double A (AA) and Triple A (AAA) sizes