5LR44.

Commonly used in pet collars and microphones. Replacement for the now discontinued mercury batteries: 5H-C, 5MR44, 5NR44, HM-5C.

Equivalents:

1501, 1501A, 1501M, 175, 5H-C, 5LR44, 5MR44, 5NR44, A175, E175, ENA175, EP175, HM5C, MN175, MN175A, MN175B, PC175, PC175A, TR175, TR175A, TR175S,

Image
not to scale. Common
Name. Dimensions.
Length × Diameter. Chemical Composition. Nominal Voltage.

A175. 27.8 mm × 12.6 mm
Contacts:
Raised area Positive.
Flat Negitive on opposite end.
Alkaline. 7.5 volts,
(6.75 volts for original Mercury types).

Image not to scale.	Common Name.	Dimensions. Length × Diameter.	Chemical Composition.	Nominal Voltage.
	A175.	27.8 mm × 12.6 mm Contacts: Raised area Positive. Flat Negitive on opposite end.	Alkaline.	7.5 volts, (6.75 volts for original Mercury types).

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