Just picked up a small 12' aluminum deep-V for pond hopping. It will be powered by an old (1977)  9.9 hp Evinrude, with a 55# thrust electric. Both on the stern. It's been awhile (30 years) since I've had a small open fishing boat like this. Is it O.K. to have the battery AND the gas tank in the rear floor compartment, behind the rear seat? Forget about balance for this discussion. I'm interested in the safety aspect of doing this. The trolling motor terminals will be screwed down on the 12V deep cycle marine battery. But, the gas tank is of the old, steel variety and will have to have the cap loosened one notch to prevent air locks. Thanks a bunch guys.

Yes, just get yourself a battery box.

Yes, just get yourself a battery box.

 

What he said!

Thanks....my thoughts exactly.

Maybe find a properly vented gas cap?