Universal rechargeable C batteries reduce waste and save you money. Made with 4% recycled batteries, these C rechargeable batteries use innovative, industry-leading technology for a reliable rechargeable C battery. The rechargeable batteries are designed to prevent leaks that can damage your electronics. Ideal for use as long-lasting flashlight batteries, in a portable radio, or other battery-powered items. Can be charged in an Energizer battery charger hundreds of times. The C size batteries hold their charge for up to 1 month in storage, and the C cell batteries have up to a 3 year battery life with normal use.