Looking for some advice, should you have any to give.

I have a large inflatable boat. Just don't have the room to store a hardbottom boat - yet. Anyway, I would like to put a trolling motor on the back. I think I've decided on the Minn Kota Eudora 30 model. Where I get confused is with the battery. From the research I've done, it looks like I'll need a marine deep cycle battery, rather than a car battery. I will probably get a portable (not on board) charger for it. Is this a good way to go? Any suggestions? I'm just going to use it to fish out of. Obviously no waterskiing or anything.

Thanks in advance.