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.