battery best practices

We have a SeaRay 240 Sundeck and it has the ability to have 2 batteries and a battery switch. Its time to replace batteries again, and I am always curious if it is better to have 2 starter batteries or 1 starter and 1 deep cycle. Most of the time, the radio and bilge pump are the only...

I recently had batteries go dead on me and was wondering if anyone has ever installed a battery charge meter to see how much charge is remaining. Or is there a good rule of thumb to know how much battery life is left?

Just bought our first Searay in Catawaba Ohio. Getting conflicting opionions how to properly run and use 2 bat set up in this boat. Have been told by Mercruiser Dealer to run on ALL always, told by most others to use just switch back and forth alternating days. 1. Will both batteries on THIS...

It's time for me to buy two new group 31 batteries for my 270 SLX. I've done a lot of reading on batteries, and I think I've decided to go with 2x Interstate Marine AGM batteries (http://www.interstatebatteries.com/m/product/agm/marine-agm). First, are these good batteries? For the price...