Energizer Industrial Alkaline C Batteries. Energizer part number EN93 (Case of 72/ or Box of 12). Energizer EN93 Alkaline C Size Batteries are 1.5V, ~8000 mAh capacity each. Zinc-Manganese Dioxide (Zn/MnO2) chemistry. No added mercury or cadmium. Metal jacket w/miniature flat contact terminals. Shelf Life: 10 years at 21°C. Designation: ANSI-14A, IEC-LR14.