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.