Rechargeable batteries come pre-charged with reusable power for all of your high-drain tools and toys so they are ready to go. Take approximately 400 photos per charge. Recharge up to 500 times. Low self-discharge technology allows batteries to stay charged longer so they are ready when you need to use them. They hold a charge two to three times longer than standard NiMH rechargeables when not in use. Recharge Plus AA Batteries are designed to hold power up to one year. Use them in any AA device and work in all NiMH chargers. For best results, use with a Rayovac charger.