4MR9. Battery Details Page.

This is a stack of 4 × LR9 or equivalent usually covered in heat shrink sleeving or some kind of case. some companies also add a positive "pip" to the battery.

Some sources state that this battery is no longer produced. If you cannot find one there are a couple of possible solutions:

Use, as the name suggests, 4 LR9 or equivalent stacked and wrap with tape or heat shrink sleeving.
Use a 4LR44 and wrap with a piece of card or some tape to bring the diameter to the correct size.

Equivalents:

114, 4A625, 4LR9, 4MR9, 4V625PX, 4V625U, A26PX, E114, EN114A, GP PX 625A4A-0, H-4D, HM-4D, PC114A, PX26, PX26A, PX26-A, PX625/4, PX 625A4A, TR114, TR114A, TR114R, V114, V114PX, V26PXA,

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

PX26. 26.5 mm × 15.9 mm
Contacts:
Raised area Positive
Raised area opposite end Negative.
Alkaline. 6 volts.
(5.4 volts for the discontinued Mercury types)

Image not to scale.	Common Name.	Dimensions. Length × Diameter.	Chemical Composition.	Nominal Voltage.
	PX26.	26.5 mm × 15.9 mm Contacts: Raised area Positive Raised area opposite end Negative.	Alkaline.	6 volts. (5.4 volts for the discontinued Mercury types)

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