The Energizer ECR1632 3V Lithium Coin Cell Battery is perfect for small electronics The Energizer ECR1632 3V Lithium Coin Cell Battery is guaranteed to last for five years in storage. Coin cell and button cell batteries are hugely popular for use in equipment such as; calculators, car keys, remote controls, bank card readers, electronic games like Hexbugs, watches, Fitbit, digital scales and even digital thermometers