Rechargeable, AAA, pre-charged batteries can be charged up to 400 times to help save you valuable resources. Long-life 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, high-powered flashlights, baby monitors and more.