I bought a terrova 55# 12 volt. My boat is a 15' bass boat. I am running a series 27 marine battery. Unfortunately, there is only room for 1 trolling motor and 1 main battery in the back. I figure the terrova will eat up the battery using spot lock so I want to add a 2nd battery run in parallel with the other trolling motor battery. The easiest way would be to locate the new series 27 battery in a different part of the boat about 6 feet away. The only other option is to cut away fiberglass on the wall behind the back seats and find a way to make a floor for it to sit on and wedge it up in there somehow.

My question is, will I find any significant loss by having the two batteries about 6-8' apart? It might be doable cutting an access hole to fit under the seats but will be a lot of work and hard to access in the future. I plan on getting a 3 bank charger and attaching. I assume it won't affect that any.

I will have 3 counting my cranking battery. Sometimes it will be low at the end of the day of I sit a lot running electronics.