Duracell® Rechargeable Pre-Charged NiMH batteries let you charge hundreds of times, helping you save money. With its Ion Core technology, you get amazing power in every battery. Plus, they come pre-charged and ready to use. They are guaranteed to last for 10 years (or up to 400 recharges, whichever comes first) in storage and they will hold a charge for up to one year when not in use. These powerful NiMH batteries work in any NiMH charger and you can recharge them up to 400 times. From storm prep to holiday needs, Duracell® is your trusted battery brand. Battery Type: NiMH Rechargeable; Battery Size: AAA; For Use With: Everyday Electronic Devices; Battery Capacity: 800 mAh.