Button batteries are widely used: - toys, calculators, music boxes, lamps, flashlights, LED decorations, pocket scales, scales, watches, bicycle counters, remote controls, measuring equipment (eg Electronic calipers, meters), medical devices (eg glucometers), laser pointers, heart rate monitors, CMOS memory backup in computers and other devices and more.

- Model: LR626 LR66 AG4
- Type: alkaline battery
- Nominal voltage: 1.5 V
- Capacity: designed: 19 mAh
- Typical: 17 mAh (22kΩ / 0.9V)
- Diameter: 6.7 mm
- Height (thickness): 2.5 mm
- Packaging: blister of 10

- Compatibility marks: L626 GA4 G4 177 377A SR626
- Type: alkaline battery
- Nominal voltage: 1.5 V