Energizer, 3V coin lithium battery, for watches & some remotes. Lithium coin battery delivers reliable performance in devices like heart-rate monitors, keyless entry, glucose monitors, toys and games. It holds power for 8 years in storage. The 3-volt battery is the replacement for 5029LC, CR2450, DL2450 and ECR2450. 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 so you should use the cell designation specified by the manufacturer of your device.