[Ian Grant]

Spotmatics use a bridge circuit in their meter, which makes them relative insensitive to voltage difference.
Any battery in the 1.3-1.5 range (alkaline, silver, ect) which you manage toi fit inside (most users use a rubber O-ring or similar to help) will work fine.

I thought only the Spotmatic F used a bridge circuit, and the older Spotmatics don't read accurately with the wrong voltage battery.

Ian