When you want big power for your small electronics, Energizer 2450BP to the rescue! Energizer 2450BP is at the top of its game as one of the leading power source standbys for everything from watches, heart rate monitors, eBooks, fitness devices, and other electronics. Not only do these 3-Volt Lithium cell batteries with 240mAhcapacity offer an impressive 8-year Shelf Life, High Energy Density, and Leakage Resistance, they are also now Mercury-Free! So, you can safely throw your old ones away without effecting the environment.