Duracell Rechargeable AA 2500 mAh batteries are longest-lasting per charge (for rechargeable AA size, per charge in same device) and let you charge 100's 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 Rechargeable AA 2500 mAh 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 Rechargeable AA 2500 mAh batteries really do set themselves apart from the rest.