Trolling Motor Extention Cord.
I rewired my TM circuit last year and installed a master shutoff switch under my console, my 80 lb 24 volt Terrova draws 56 amps. The chart told me I needed 4 gage.
If your wire is not correct, things get hot and that's how fires happen.
If you get a battery box for the bow, I think you can terminate directly to the posts it provides. You can probably buy red/black 8 awg wire cheaper off a spool than getting jumper cables and then just terminate it yourself. I would put some kind of disconnect at trolling motor side though in case you want to unplug it.