"Energizer Industrial D Alkaline Batteries- the very name itself signifies how much robust and powerful this brand might be. The heavy, long lasting and compatible industrial batteries are now leading the market of its own kind due to the reliable service it provides. The special characteristics of rendering equal power in fluctuating temperature have made them unique and trustworthy. So, if you are still looking for a static power generator for your small but high draining devices then this is the high time to grab the opportunity of selecting this brand and get relaxed!!!!! • Features: One of the long-lasting power source. No mercury added means no special disposal. Operate well in extreme temperature. Still good to go even after 7-years of storage. Designed for long-lasting performance in devices like wireless microphones, ear monitors, hand held devices, pagers, remotes, flashlights, calculators, meters, door locks, cellular phones, cameras, infusion pumps and more Associated Battery Sizes: 13A, 13D, 813, AL-D, AM1, D, E95, EN95, KD, LR20, LR20XWA, MN1300, MX1300, PC1300, R20 • Specifications: Classification: Alkaline Chemical System: Zinc-Manganese Dioxide (Zn/MnO2) Designation: ANSI-13A, IEC-LR20 Nominal Voltage: 1.5 volts Nominal IR: 200 to 400 milliohms (fresh) Operating Temp: -18°C to 55°C (0°F to 130°F) Typical Weight: 139 grams (4.9 oz.) Typical Volume: 56.0 cubic centimeters (3.4 cubic inch) Jacket: Plastic Label Shelf Life: 10 years at 21°C Terminal: Flat Contact Manufactured: Made in the USA"