SR721SW/362 battery is a small, button/coin-cell non-rechargeable battery, generally utilized in wrist watches, credit card dimension units, distant controllers, calculators, medical instruments, and related. Lithium batteries are commonly used in high-drain gadgets like flashlights, photo gear, medical and safety gadgets, and comparable. Lithium batteries are one of many largest normal size cylindrical rechargeable lithium batteries based mostly on several related lithium battery chemistries with every one providing its own professionals and cons. SR57, LR57, 395, 399, SR927SW, AG7, and so on. batteries are extremely popular button/coin cell non-rechargeable batteries, obtainable in alkaline and silver-oxide chemistries and manufactured by practically all battery manufacturers. When exposed to ambient air, lithium reacts rapidly with humidity and oxygen to type a skinny film of oxide, and might type nitrides on longer publicity to nitrogen.