The Panasonic 4SR44 is a silver-oxide battery designed to provide steady power for a variety of small electronic devices. It features a nominal voltage of 6.2 V and a capacity of 160 mAh, which it achieves through four SR44 cells stacked vertically within its compact cylindrical body measuring 13 mm in diameter and 25.2 mm in height. Because this battery is mercury-free, it is a safer choice for the environment while powering everything from film cameras and medical devices to dog collars and car security systems. You will find it compatible with devices requiring PX28, V28PX, 544, or A544 labels, making it a reliable power source for calculators, toys, and small LED flashlights.