Energizer 321(SR616SW) Low Drain 1.55V Silver Oxide Watch Battery Download Spec SheetThe Energizer 321 battery is a low drain 1.55 Volt silver oxide button cell battery. The 321, or SR616SW, is a popular silver oxide cell commonly used in Watches, calculators, small electronics, toys, lasers, digital assistants, keyless entry systems, digital thermometers, LED lights, electronic books, pedometers, calorie counters, stop watches, sporting goods & medical devices. Energizer goes beyond the basic battery sizes to bring you the ones you need.This is a "SW" low drain battery. 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, etc.SpecificationsChemistry: Silver OxideVoltage: 1.55VAmperage: 15mAhDiameter: 0.267717"Height: 0.06496063"Also Known As: 1174SO, 280-73, 321, 611, D 321, D321, DA, GP321, R 321/38, RW 321, SB-AF/DF, SP321, SR 616 SW, SR616, SR616SW, SR65, V321SpecificationsBrand: Energizer  Output Voltage: 1.55V  Amperage: 15mAh  Chemistry: Silver Oxide  Battery Size: 321  Height: 0.06496063"  Diameter: 0.267717"  Country of Manufacture: JapanCompatibilityEnergizer: 321TS  Other: 1174SO, 280-73, 321, 611, D 321, D321, DA, GP321, R 321/38, RW 321, SB-AF/DF, SP321, SR 616 SW, SR 65, SR616, SR616SW, V321 Â