Rechargeable NiMH Batteries with Duralock Power Preserve Technology, AA, 4/Pack Reusable NiMH batteries are ideally suited for high-drain or frequently used devices. Recharge up to 300 times with no memory effect. Battery Type: NiMH Rechargeable; Battery Size: AA; For Use With: Everyday Electronic Devices; Battery Capacity: 2400 mAH.