4LR44. Battery Details Page.

This is 2 × 1/3N or 4 × LR44 in series with a shrink cover holding them together, and can be replaced by those, and a little ingenuity for the positive "pip", if required.

One point to note is that if the equipment is voltage sensitive it would be best to avoid Alkaline types as the voltage output is not stable over the life span of the battery.

Equivalents:

2CR1/3N, 2CR1108, 2CR1108/281, 2CR11108, 4AG13, 4G13, 4G-13, 4H-C, 4LR44, 4LR44EP/1BB, 4LR44P, 4MR44, 4NR44, 4NZ13, 4SG13, 4SR44, 7H34, 23-469, 23-544, 28, 28A, 28L, 28SO, 476A, 537, 544, 544A, 544L, 544S, 1406LC, 1406SOP, 1414A, 4034PX, A28, A28PX, A544, A54464, CR28L, ETR-S, GP476, GP476A, HM-4C, K28, K28A, K28L, KS28, KX28A, L28PX, L544, L544BP, L1325, L1325F, OX28, PX-28LB, PX28, PX28A, PX28AB, PX28L, PX28LB, PX28LBPK, PX28-S, RFA-16, RFA-16-11, RFA-18, RFA-18-11, RPX28, S1325, S1325S, S28PX, V28PX, V28PXL, V34PX, V4034PX,

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

A544. 25.2 mm × 13.0 mm
Contacts:
Raised area Positive.
Flat Negative on opposite end.
Alkaline,
Lithium,
Silver Oxide (Ag₂O).
6 volts
6.2 volts (Ag₂O),
(5.4 volts for original Mercury types).

Image not to scale.	Common Name.	Dimensions. Length × Diameter.	Chemical Composition.	Nominal Voltage.
	A544.	25.2 mm × 13.0 mm Contacts: Raised area Positive. Flat Negative on opposite end.	Alkaline, Lithium, Silver Oxide (Ag₂O).	6 volts 6.2 volts (Ag₂O), (5.4 volts for original Mercury types).

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