Charge retention:up to 50% charged after 12 months10X More Power Stay Charged for longer life This battery pack of four is equivalent to 12,000 single-use batteries Discharge: Batteries are equipped with low self discharge mechanism to hold charge upto 80% for 12 months without use Compatibility: APRAMATT AA Batteries are compatible with numerous devices including Remote Controls, Electronic Toys, Flashlights, Capacity:Best in Industry 3300mAh capacity batteries with no memory effect so they can be charged or discharged as needed without loss of capacity Pre-charged and ready to use They work in any NiMH charger