Used in heart-rate monitors, keyless entry, glucose monitors, toys & games. Keep in original package until ready to use. Dispose of used batteries immediately. (2) Risk of injury due to fire, explosion or leakage. Do not disassemble, charge, crush or expose to fire or high temperatures. Important: Coin Lithium batteries are not interchangeable. Both the diameter and thickness can vary based on the cell designation. While some device battery compartments may be sized in a way that different battery types can fit in the compartment, the capacities will vary by size. Energizer recommends that you use the cell designation specified by the manufacturer of your device or identified in the list provided above.