CR2430 is a lithium battery made by Energizer. It is designed to provide long life, reliable and consistent power for small electronic devices. It has a diameter of 24 mm, a thickness of 3 mm, and a capacity of 210 mAh, meaning it can provide 210 milliamp-hours (mAh) worth of power. It is commonly used in watches, computer motherboards, toys, calculators, and other small devices that require low-power operation. It also has a low self-discharge rate, meaning it can retain over 80% of its charge after one year of storage.