The Duracell Specialty 2450 lithium button cell batteries are made of high-purity lithium for reliable, long-lasting energy. Thanks to Duralock Power Preserve technology, you can store them for 10 years, so you can trust that these batteries will be charged when you need them. For the safety of your children, they are packed in child-resistant packaging. They are designed for use in electronics (bike computers, scales, clock radio, electronic calendar), security (bank card reader), medical devices (glucometers, heart rate monitor), fitness equipment (pedometer) and lighting.