VARTA Batteries V28PX/4SR44, 1 piece, 6.2 V, special batteries for small electronic devices - watches, calculators, made in Germany : Amazon.de: Electronics & Photo
Battery Adapter 4LR44 to PX32 HM-4N for Antique Camera YASHICA - Etsy Finland
Duracell Lithium 28l 6 Volt Camera Battery Px28lbpk 1 Pk
Toshiba
GP Minicell Size 23A 12Volt Alkaline Battery
50pcs 4LR44 476A L1325 6V Dry Alkaline Battery Cells For Car Remote Dog Training Collar2CR1-3N CR28L 1406LC 2CR11108 - AliExpress Consumer Electronics