Im talking about EM3EV spotwelder, and this video:
   • A look inside Ericssons MASSIVE 48V50...  

Im still confused about the capaity:
Its clearlly 13S, and its 20P. Maby i was mistaked and it's not 21700, then its probablly not 50E, and there are 100's of cells which are blue and white. The case says 50A, so the cells are only 2,5Ah.