Duracell Rechargeable AAA 750 mAh Batteries, Pack of 4Duracell Recharge Ultra AA batteries are Duracells #1 longest-lasting per charge* and let you charge 400 times. With a Long-Life Ion Core you get amazing power in every battery. Plus, they come pre-charged so you can power your devices right away and will stay charged for up to 12 months, when not in use. Additionally, unused Duracell Recharge Ultra batteries are guaranteed to last 5 years. These powerful NiMH batteries work in any NiMH charger. With a longer-lasting charge and fewer recharges, Duracell Recharge Ultra AA batteries really do set themselves apart from the rest. *for rechargeable AA size, per charge in same device