Ray-O-Vac High Energy D Alkaline Battery reliable power with mercury- alkaline technology and Ready Power technology, ensuring long-lasting performance. These batteries are to hold power for up to 10 years in storage, making them i for a variety of devices including calculators, electronic gadgets, smoke alarms, and digital cameras. Each battery provides a strong 1.5V output with a capacity of 17500 mAh, delivering dependable energy when you need it most. Available in packs of two or twelve, these D size batteries combine durability with convenience for everyday use. Model Number: 813-2K