These Duracell Recharge Ultra AA 2500mAh Rechargeable Batteries combine the convenience and power of an alkaline battery with the money saving and environmental benefits of a rechargeable battery. The high capacity of these batteries means they can be used in various devices such as digital cameras, hand held video games and wireless mice to name a few. These Duracell Duralock rechargeable batteries are guaranteed to last 5 years and with the Duralock Power Preserveï¾™ Technology the batteries holds a charge for up to 1 year when in storage. Impressive!