Energizer E2, CR2, 3V, photo lithium battery, comparable to Duracell #DLCR2. 3-Volt e2 Photo Lithium Battery is designed for use with cameras, photoflash, calculators, pocket pagers, watches, memory backup and other high-drain applications. 3-Volt e2 Photo Lithium Battery performs even in extreme temperatures. Storage life lasts up to 10 years.