LR44 battery

"SR44" redirects here. For State Route 44 or State Road 44, see list of highways numbered 44.

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, vibrators, multimeters and laser pointers.

LR44 alkaline cell

The battery nomenclature is defined by the International Electrotechnical Commission (IEC) in its 60086-3 standard (Primary batteries, part 3 Watch batteries). The letter L indicates the electrochemical system used: a zinc negative electrode, manganese dioxide depolarizer and positive electrode, and an alkaline electrolyte. R44 indicates a round cell 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 including:

4.5-volt, D, C, AA, AAA, AAAA, A23, 9-volt, CR2032 and LR44 batteries

Other types of batteries are or were made in the R44 size. Formerly, mercury batteries were made as button cells (types MR44 and NR44). 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. Manufacturer's numbers for silver oxide R44 size cells include:

  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withdrawn† 		Zinc–air battery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
† See product ban on mercury batteries

See also

External links