I have this Image I down loaded it from the US sight,
have been trying to find the topic still looking however BatteryWorld etc have miniture spot welders for welding batteries together, see the 2 spot weld marks
on the tab, like in drill battery packs, the battery is similer to the fog battery 2025 (20mm dia 2.5mm thick) there might be even enough room to us a 2030
this used in Computers to save Bios settings, some back in the 90's had tabs and were solded to the board.


