Trinity scores Trolling motor!

[Rookie]

So Terry, Joe and I were out jumping on Sunday. Mucking around Terry finds an old Minn Kota trolling motor in 15 feet of water that looks likes its been underwater for a few years! Bringing it back to the boat, there is a discussion on if it will work or not! So Terry drains water and muck from the unit and asks me to hook the leads to his 12 volt battery! Terry is convinced that it will fire right up and Joe and I are concerned that it will either start on fire or do nothing at all! With apprehension I hook the leads to the 12 volt battery, half expecting the battery to explode in my face-check out the video to see what happened!