112v battery for old school Geiger counter

I collect and repair old 1950's Geiger counters. These often use high voltage batteries no longer available. In the past I have used DC-DC converters but this isn't ideal.

3v CR2032 or similar batteries are perfect, they are low cost ($2 for a pack of 5) and can easily be stacked together. Chose to separate into 4 compartments just because.

This counter needed a 45v + 67.5v battery in series, so I have replaced with a single 112v pack. Cells are pressed together with a small nut and a