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.
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.
The LR44 is also known as LR1154, AG13, A76, 157 (alkaline), SG13, S76, 1166A.
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.
| Alkaline | Silver oxide | Mercuric oxide withdrawn† |
Zinc–air battery | |
|---|---|---|---|---|
| IEC name | LR1154, LR44 | SR1154, SR44 | MR1154, MR44 | PR44, PR675 |
| ANSI/NEDA name | 1166A | 1107SO | ||
| Typical capacity | 150 mAh | 200 mAh | 600 mAh | |
| Nominal voltage | 1.50 V | 1.55 V | 1.35 V | 1.35 or 1.40 V |
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