The Energizer CR2025 Lithium Coin Battery is one of the most common 3v lithium cells, The coin cell battery can be used in devices such as key fobs, calculators, medical devices, remote controls, watches and toys etc. This convenient single cell pack from Energizer gives you a reliable power source, with a twin pack providing valuable backup. Due to the lithium chemistry within the battery, you can leave these batteries aside as a spare for up to 8 years. The lithium make-up also means these cells are very light in weight and extremely temperature tolerant, performing reliably at -20C to 60C.