As a point of interest what size is your battery and motor/s, I ask as my electric shunter runs a pair of 38amp hour batteries with bolt on connectors supplying 3 x 150 watt motors. I worked on the current the motors were likely to pull say 12 amps ish so the batteries should give a two/three hours of running or may be a bit more with regen braking.
I would use normal spade connectors to connect that battery and fit a isolating switch so the batteries can be isolated easily should a problem arise.
Bob