Brand: Maxell. MPN: SR621SW. Maxell Silver Oxide SR621SW Low Drain Watch Battery Replaces 362 364 364BP 531 602 AG1 D 364 D364 GP364 L621 LR60 LR620 LR621 This battery is a Silver-Oxide cell normally used in watches with a shelf life of 5+ years. Other applications may include calculators film cameras medical instruments cash registers or FA instruments (measuring instruments onboard microcomputers sensors). Low drain batteries are best used in devices that use a small amount of power over a long period of time: Analog watches TV remotes alarm clocks etc. This is in comparison to high drain batteries which are for devices with a continuous low power use and occasional high peaks: Analog and digital watches with extra functions (backlight alarm) pocket calculators electronic games cameras.