Energizer CR2450 3V  Lithium battery With so many devices that need power, it's always a good idea to have a spare battery on hand. The Energizer CR2450 3V Lithium battery is a perfect fit for your devices. it is also environmentally friendly. 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.