A button cell, watch battery, or coin battery is a small single-cell battery shaped as a squat cylinder typically 5 to 25 mm (0.197 to 0.984 in) in diameterand 1 to 6 mm (0.039 to 0.236 in) high — resembling a button. this is best Lithium coin/button cell.
Stainless steel usually forms the bottom body and positive terminal of the cell; insulated from it, the etallic top cap forms the negative terminal.Button cell use in RTC modules as power source Button cells are used to power.
Small Portable electronics devices such as wrist watches and pocket calculators. Wider variants are usually called coin cells. Devices using button cells are usually d