15F15.

Basically this battery is, now, a stack of 15 × LR54 with a metal "pip" contact plate at each end and a casing to hold it all together.

Equivalents:

15F15, 15LR54, 221, 505, 75, 505E/B, A221, B155, BA 333/U, BL-MV15, BLR155, M505, MV15, MV15E, NR75, W15, Y15, Y-15,

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

505. 50.9 mm × 15.9 mm × 15.1 mm
Although some are round:
50.9 mm high × 15.9 mm diameter
Contacts: Raised areas either end for Positive and Negitive.
Carbon Zinc 22.5 volts.

Image not to scale.	Common Name.	Dimensions. Height × Width × Length.	Chemical Composition.	Nominal Voltage.
	505.	50.9 mm × 15.9 mm × 15.1 mm Although some are round: 50.9 mm high × 15.9 mm diameter Contacts: Raised areas either end for Positive and Negitive.	Carbon Zinc	22.5 volts.

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