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Battery Information
Battery Details

This battery is sometimes referred to as 1/2AA or 1/2AA Alkaline. Don't confuse with the 3 volt 1/2AA or the 1/2AA size rechargeable type that are 1.2 volts.

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:

1/2AA, 1/2AA Alkaline, 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, 6231, A28, A28PX, A544, A54464, CR28L, ETR-S, GP476, GP476A, HM-4C, K28, K28A, K28L, KS28, KX28A, L28PX, L544, L544BP, L1325, L1325F, OX28, P28PXL, 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.
battery
battery 		A544. 25.2 mm × 13.0 mm

Contacts:
Raised area Positive.
Flat Negative on opposite end.layout
OR
"Pips" either end.layout

Alkaline,

Lithium,

Silver Oxide (Ag2O).

6 volts
(170 mAh).

6.2 volts (Ag2O),

(5.4 volts for original Mercury types).

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