The thought of running wire between these chunks of battery to the motor, enough wire to carry that power, ... nope. Running 12ga and 10ga for stereos was hard work, running multiple spans of #00 for battery packs where the transmission and gas tank and whatever else used to be is not feasible. The insane fringe of hobbyists will do a few but most of them, even, will be using single, swappable commercial packs they cram in $somewhere.
Rather than thicker-gauge wire, how about going all-in on the crazy hacks and running thin little high-voltage transmission lines through your car, heavily insulated—like, undersea cable ratio of insulation to core—with transformers on either end?
I’d love someone to do an experiment where they set this up, then crash the car in a way that tears the cables up, and see how much everything arcs :P
For some reason, commercial EVs tend to have batteries that run in the 300-400ish volts range, whereas conversions tend to be more in the range of about 100 to 200 volts. Lower voltage means more amps which means thicker wires [1], which are kind of heavy and expensive but it's not generally a huge problem as far as I know.
