Highfields Amateur Radio Club
Glossary of Radio Terms.

Appendix:
Battery Details.

A Mercury free replacement for the once popular MR52 and equivalents. These Alkaline cells produce 1.5 volts, which is higher than the 1.35 volts produced by the original Mercury cell. Most devices accommodate the small increase in voltage and function perfectly

If you need an exact voltage replacement for the MR52 you could consider either the Zinc Air cell adaptor (right) with an MRB675 or the Silver Oxide 392 cell, MR44 and MR52 Adaptor combination (left and right), all from the Small Battery Company. Possibly the better solution is the 2 adaptors and the 392. The MR-44 Adapter has the outer dimensions of the MR44 Mercury cell with a recess that takes the inexpensive and easily obtained Silver Oxide 392 cell. Within the MR-44 Adapter are micro electronics that drop the voltage from the 1.55 volts put out by the Silver Oxide cell to the 1.35 volts that your equipment was designed for. This combination then slips into the MR-52 adaptor.
Why did I say "Possibly the better solution?" Well Silver Oxide cells are readily available, cheaper than Zinc Air cells and last longer too.

Equivalents:

Image not to scale.	Common Name.	Dimensions. Length × Diameter.	Chemical Composition.	Nominal Voltage.
	LR52.	11.2 mm × 16 mm Contacts: Case and flat base Positive. Raised area Negitive.	Alkaline,	1.5 volts. 1.35 volts (for the discontinued Mercury types)