Help with modification batteries

Hi new to the modification seen and i am after a little help don’t know much about the 18650 batteries that are used in the evolve GTR. I am wondering is it possible to just make a new battery with 26800 and plug into existing electrics or will this not work? If not can You explain why and what I would need to do to make it work. I know a 10s4p 26800 will not fit in the board I can make it fit that is not a problem. I am doing this for more range as I am 95kg with all equipment and I’m getting 17mile at the moment. Any help will be greatly appreciated