The Duracell Recharge Ultra AA 2500 mAh batteries are our No. 1 long- life rechargeable battery and can be recharged 100 times. With their long-life ion core, you'll experience fantastic performance from every battery. What's more, they come fully charged so you can power your devices immediately and they stay charged for up to 12 months when not in use.... What's more, the unused Duracell Rechargeable Ultra batteries have a guaranteed shelf life of 5 years. These powerful NiMH batteries can be charged with any NiMH charger. With their longer-lasting charge and fewer charging processes, Duracell Rechargeable AA 2500 mAh batteries really stand out from the rest.