This past week I launched my Carver for the season. Of course it would not crank as the battery that I knew was weak last season had died. I tried charging it with my battery charger but to no avail. I had to purchase a new battery. The batteries in the boat are/were NAPA Group 24 Deep Cycle batteries. There are 2 of them. I bought another NAPA Group 24 Deep Cycle to replace the dead one.

Battery #2 I also placed on my charger. When you first put a battery on the charger it does a battery check then charges if needed. The 2nd battery the charger went into check mode and within a few seconds the led gauge on the charger lit up and showed that the battery was fully charged. I had intended to buy 2 new batteries but the NAPA store only had one in stock. Since the 2nd battery seems to be in good condition I am going to start the season out with it and see how it holds up.

The location of the batteries is between the engines on this boat. The aft battery was a chore to get out because of its location so that is why I decided to replace a Group 24 battery with another Group 24. There is no way that I could muscle in or out a Group 27 or 29 where the aft battery is located. The forward battery is located far enough forward that I can easily pull out or place in.

Now to my question. If the remaining battery that I have decided to keep on should need to be replaced could I replace it with a Group 27 or 29 battery? Is it OK to mix battery sizes in this application. Can I have 1 Group 24 battery and one Group 27 or 29 battery working with the Group 24 battery. Or is it best to keep both batteries the same?

When I had my Bayliner 3055 Ciera all 4 batteries were the same Group 27's and I never had any battery problems.

Thanks in advance for your responses.