Energizer CR2450 Lithium Battery, 3v ECR2450, Qty 6. Performs in extreme temperatures (-22 to 140 F). Replacement for: 5029LC, CR2450, DL2450, ECR2450. Child Resistant Packaging. Holds power for 8 years in storage. Reliable power for a range of devices: heart-rate monitors, keyless entry, glucose monitors, toys & games.