soldering a lithium 18650 cell : r/diyelectronics
You can solder the cells. The difficulty is having a soldering iron that can get the heat in there nice and quick, there''s plenty of metal to heat up. If I can''t get it to stick, I try again later so I don''t put too much heat into the cell. My current battery for my bike (18s,18p) is all hand soldered with fuse wire and has been working