Need battery help for friends boat

[ProMaxx316]

I dont know much of the details of the boat. All i mainly caught was that it's a big boat, has a fridge that runs and other accessories that kills the battery all the time.

As of now he's using a interstate Pro-27m the specs are

CCA - 675

RC - 180

CA - 845

RRC - 100

I just learned that RRC in sort means the battery is made to "go dead" and be recharged a lot of times.

My buddy is mainly trying to find a battery that might give him a little more life so he dont have to run on a charger for so long.

So anyone has any sugestions?

[bdog]

how many does he have? most big boats should have quite a few and one starting battery per engine that is separated by isolators

[Skullz]

Least expensive route to take.

http://www.remybattery.com/Deka-Intimidator-9A34M-AGM-Marine-Battery-P9239.aspx

[ProMaxx316]

I think it's his secondary battery. He did mention that he has to start his generator to charge up the interstate. So assuming one starter battery and one for other stuff.

[Tarball]

In this situation he will need the biggest and the most deep cycle batteries that he can afford to allocate for the fridge and accessories. That or leave the generator running and spend money on fuel.