AA: Providing a gradual self-discharge, the long-lasting AA batteries maintain 70% of their capacity for 6 months and 50% of their capacity for 12 months. AAA: Providing a gradual self-discharge, the long-lasting AAA batteries maintain 80% of their capacity for 12 months. The AmazonBasics high-capacity batteries come pre-charged and ready to use right out of the box. They can be recharged hundreds of times with minimal power or capacity loss. To help ensure safe operation for both the user and the device, the rechargeable batteries provide high-quality components and a leak-free design that locks in power until it’s needed. Even after three years, the batteries can be fully recharged. AmazonBasics brings you everyday items at a great value. An Amazon Brand.