Energizer Eveready 1.5 V D Alkaline Battery measuring 34.2 mm Dia X 61.5 mm is ideally designed for delivering the long lasting power source of all primary batteries over a range of sizes and is perfect for operating well in extreme conditions. Battery is also designed for meeting heavy current and continuous use demands. Battery with 7 yrs excellent shelf life operates well in temperatures ranging from -30 to 55 deg C and comes with no mercury content.