Replacing Batteries

What size are they? On a boat that size I doubt that they re bigger than g31. Not that heavy

http://cruisersyachtsownersclub.com is pretty active, should be some hands-on experience there about batteries and many other issues on that boat.

Un-bolt the cables, reach in and pull them out. Son-in-laws are good for this abuse. Not sure what else can be explained.

If you have to ask, DON'T. Short out a battery cable or hook one up backwards and you'll be in a world of expense. Pay someone knowledgable to do it.

Geeeze Skippy J, I was looking forward to another July fireworks show..

Poof!!!!

I'm thinking his question referred to access, rather than how to disconnect/connect batteries. That boat has some access challenges. If he can find a group with that same boat and DIY tendencies, he might find someone has a clever solution.

If he was knowledgeable about doing the job, he would have figured out the access or method in order to change them. We're not talking about changing 8D's here.

And we're not talking about an engine room with standing room and overhead rail hoist. People who know how to change spark plugs still go online to figure out how to change the rear bank on a transverse V6 all the time, because after enough people tinker with a given car model, hopefully someone finds a way that doesn't cost a lot of time and blood. Batteries on his 3375 might take a lot longer than changing a rack of 8Ds. Someone might have figured out it is easier to take off a riser than fight around it. Changing a battery that is easy to get to, safely, is a pretty simple thing if that is the advice he seeks.

Or, We can wait for the OP to tell us what he wanted..