4-pack. "AA" platinum rechargeable batteries are pre-charged and ready-to-use right out of the package. Platinum batteries maintain their charge 3 times longer than standard rechargeables when not in use. Takes up to 16 times more digital pictures than lithium after 35 charges, and 4 times more digital pictures than standard alkaline batteries. Platinum batteries won't loose their charge capacity over time. Recharge up to 400 times. Ideal for high drain devices.