Rechargeable, AAA, precharged batteries can be charged up to 400 times to help save you valuable resources Longlife Ion Core provides a reliable source of power to hold a longer charge Duralock Power Preserve technology holds a charge for up to a year when properly stored Versatile design can be used with all NiMH chargers sold separately Batteries are perfect for use in video game controllers, highpowered flashlights, baby monitors and more