Tianqiu AG4 10Pc Alkaline Button Cell Watch Batteries
Button cells are commonly used in electric watches, clocks, timers, calculators, laser pointers, toys, LED "blinkies", and novelties. The alkaline button cell batteries from Tianqiu have a power output of 1.55v and have a shelf life of 5 to 10 years when stored at room temperature (70°F/ 21°C).
