Energizer CR1620 3V Lithium Battery Energizer CR1620 3V Lithium Battery is a battery that can be used in various devices, including clocks, calculators, toys, and watches. The battery is a long-lasting, long-life battery. The CR1620 battery has a long shelf life, as well as a long life span. The battery is designed to work with many devices, which is helpful for those who need to replace their batteries often. The CR1620 battery is great for people who want to save money and are environmentally conscious.