As far as the trolling motor is concerned, it doesn't know what kind of battery it is hooked up to. But the problem is that you will prematurely kill your battery by using a normal auto "cranking battery" for prolonged periods of draw down and the recharges. They (auto batteries) are not built for such cycles, they are designed to provide starting and running power for the car and accessories but it is depenedant upon the autos charging system (alternator) to keep the battery full or "hot" all the time.

Trolling motor batteries have a different build that allows them to be drawn down and recharged many times. "Dual action" batteries are a combination of the two, they can be both drawn down and recharged OR they can provide big bursts of power for cranking marine engines. But again the types of batteries used in automobiles feature none of those capabilities.

If all you are going to do is run the troller for 1 or 2 days then yeah you can use it. BUT it will damage the overall life of the battery. PLUS like Chuck said, how are you going to recharge the battery? And another (and MUCH more expensive thing to think about) recharging a low/dead battery with your cars alternator is very tough on that system and will potentially kill your alternator which would cost you MUCH more than simply buying a trolling battery for your boat.

Good luck,
RA