Duracell Rechargeable AAA 900mAh batteries let you charge 100's times and 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. These powerful NiMH batteries work in any NiMH charger. With a longer-lasting charge and fewer recharges, Duracell Rechargeable AAA 900mAh batteries really do set themselves apart from the rest.