Almost 4 years ago I tried to raise the possibility that it wouldn’t be a good idea to add button tops to high drain cells
and elsewhere on this forum when I brought up the subject I was ignored. High drain cells are made with flat tops so that they can be spot welded into battery packs. Those spot welds connect the cell directly into the pack, not onto a button top that has to make relatively loose contact with another conductor. Also those spot welds are very large and robust.
This question of high IR with added button tops has been coming up over and over again on this forum. Here are some links to other threads that were started on this subject.
Solved: Internal resistance increase with button top VTC6 and 30Q
Anyone else had dud Samsung 30Q button tops from BG recently?