LR44 battery

LR44 is the IEC designation for an alkaline 1.5 volt button cell, commonly used in small LED flashlights, digital thermometers, calculators, calipers, watches, clocks, toys and laser pointers. LR44 alkaline cell (marked with its alternate name of AG13) The battery nomenclature is defined by the International Electrotechnical Commission (IEC) in its 60086-3 standard (Primary batteries, part 3 Watch batteries). The first letter L indicates the electrochemical system used; a zinc negative electrode, manganese dioxide depolarizer and positive electrode, and an alkaline electrolyte. The second letter R indicates a round (cylindrical) form. R44 indicates the size is 11.4 ±0.2 mm diameter and 5.2±0.2 mm height as defined by the IEC standard 60086. Manufacturers have their own part numbers for IEC type LR44 batteries. 4.5-Volt, D, C, AA, AAA, 9-Volt, SR41/AG3, SR44/AG13 batteries Other types of batteries are or were made in the R44 size. Formerly, mercury batteries were made as button cells. Zinc-air batteries type PR44 require air to work. Silver-oxide batteries type SR44 may provide extra capacity compared to LR44 types but have slightly different voltage characteristics. Performance of a device meant to use a silver-oxide battery may be degraded with substitution of LR44 types.