Because the way BMSs are wired, I usually treat + as the “common” side and do all the fusing and switching on the negative side.
It’s only because of the BMS setup. If they were set up with a common B- and had P+ and C+ then I’d do it the other way around.
It really doesn’t matter which side of the jack you fuse, as long as the fuse is in series with the circuit.
yep, this