Rayovac's Recharge line offers your best value in rechargeable power for high-drain devices. Pre-charged and ready to use out of pack. Low self-discharge technology holds charge 3X longer than standard NiMH rechargeable when not in use. Recharge up to 500 times. Keep disposable batteries out of the landfills and save hundreds of dollars when you use rechargeable batteries versus alkaline. Batteries can be used in any AA device and work in all NiMH chargers. NiMH rechargeable batteries do not have a memory effect, it is OK if you repeatedly recharge them after only being partially discharged.