COIN CELL BATTERIES ARE THIN CIRCULAR BATTERIES OFTEN USED TO POWER HEARING AIDS WRISTWATCHES KEY FOBS DIGITAL CALIPERS AND TEST INSTRUMENTS AND SMALL FLASHLIGHTS COMMONLY CALLED BUTTON BATTERIES OR WATCH BATTERIES THEY HAVE A LOW SELF-DISCHARGE TO HOLD THEIR CHARGE FOR A LONG SHELF AND SERVICE LIFE THESE BATTERIES CAN BE DISCARDED WHEN THEIR CHARGE RUNS OUT
