Stewart Duncan-Alien 200A 16S Air

Hi Bruno
Well I got the transmitter you suggested and the 200A ESC is working great. Not tried the 120A, wait for the next build to do that.
What I have done though is to damage a cell in the 6S battery. Silly me did not notice it was to close to a screw, that I had not cropped and the friction wore through the outer shell. I covered the area with fiberglass resin to protect it but the cell does discharge faster than the rest. Is it possible to replace one cell?
Thanks for all your help.
Best regards
Stewart