Found a Minox 35 GT in super good condition (just needs a good clean). I adapted the battery compartment to use 4 LR44 cells, that are about the same size of the
Minox 35 GT - Vintage Camera Lab
Found grandpa's old tiny little camera. Any tips on the battery? : r/AnalogCommunity
Minox 35 GT | Ground-Glass .net
Amazon.com: Battery-Biz Inc. 3 Volt Lithium Battery : Automotive