201 Battery Details Page.

This 201 battery has been discontinued a close match is the LR54. Details of both are shown below with the difference highlighted.

Image
not to scale. Common
Name. Dimensions.
Diameter × Thickness. Chemical Composition. Nominal Voltage.
battery 201. 11.6 mm × 3.3 mm
Contacts:
Case and flat base Positive.
Raised area Negative.
Silver Oxide (Ag₂O). 1.55 volts(Ag₂O).
battery LR54. 11.6 mm × 3.1 mm
Contacts:
Case and flat base Positive.
Raised area Negative.
Alkaline,
Silver Oxide (Ag₂O).
1.5 volts.
1.55 volts(Ag₂O).

Image not to scale.	Common Name.	Dimensions. Diameter × Thickness.	Chemical Composition.	Nominal Voltage.
	201.	11.6 mm × 3.3 mm Contacts: Case and flat base Positive. Raised area Negative.	Silver Oxide (Ag₂O).	1.55 volts(Ag₂O).
	LR54.	11.6 mm × 3.1 mm Contacts: Case and flat base Positive. Raised area Negative.	Alkaline, Silver Oxide (Ag₂O).	1.5 volts. 1.55 volts(Ag₂O).

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Highfields Amateur Radio ClubGlossary Appendix. Battery Details.

Highfields Amateur Radio Club
Glossary Appendix.

Battery Details.