4LR43.

If you need an exact voltage replacement for the PX27 or V27PX producing exactly 5.6 volts, then consider the voltage reducing V27PX Adapter from The Small Battery Company.
Possibly the best solution to problem of the discontinued Mercury battery, the V27PX Adapter has the outer dimensions of the PX27 Mercury battery with a recess that takes four inexpensive and easily obtained Silver Oxide SR43 cells. Within the V27PX Adapter are micro electronics that drop the voltage from the 6.2 volts produced by the four silver oxide cells to the 5.6 volts that your device was designed for. No adjustment or modification to your equipment is required.

Equivalents:

4AG12, 4LR43, 4NR43, 4SR43, EPX27, HS3C, KX27, PX27, PX27A, PX27S, RPX27A, RPX27S, S27PX, U27PX, V27PX,

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

PX27. 20.5 mm × 12.7 mm
Contacts:
Raised area Positive
Raised area opposite end Negitive.
Alkaline,
Silver Oxide.
6 volts.
(5.6 volts
for the discontinued Mercury types)

Image not to scale.	Common Name.	Dimensions. Length × Diameter.	Chemical Composition.	Nominal Voltage.
	PX27.	20.5 mm × 12.7 mm Contacts: Raised area Positive Raised area opposite end Negitive.	Alkaline, Silver Oxide.	6 volts. (5.6 volts for the discontinued Mercury types)

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