Highfields Amateur Radio Club
Glossary of Radio Terms.

Appendix:
Battery Details.

This is an unusual and increasingly hard to find Silver Oxide battery. It is commonly used in remote alarm controls for VW and Audi alarm systems and is particularly widely used in later Volkswagen Logic immobilisers known as "Logic", "Conlog" or "Conlogic". These immobilisers were widely fitted to Audi, VW and Land Rover vehicles.

It is constructed from a stack of four SR48 button cells held with heat-shrink tubing. You will be able to see 393 or SR48 etched into the uppermost cell. If you prefer to 'do-it-yourself' you can stack 4 of these cells and wrpa some electricians tape around them. Be sure to use the Silver Oxide cells though as the Alkaline ones are not suited to this application.

Equivalents:

Image not to scale.	Common Name.	Dimensions. Length × Diameter.	Chemical Composition.	Nominal Voltage.
	4SR48.	21.6 mm × 7.9 mm Contacts: Flat base Positive. Raised area other end Negitive.	Silver Oxide,	6.2 volts.