adding to coach battery capacity

brianokeefe wrote:
After the advice here and checking with battery stores it's obvious that any 12V set up would be no improvement and probably worse. I will explore the 6V solution and using sealed batteries can have one in the coach. I just need to find a good supplier as they are not available here in my town. My current coach battery is a 10" depth so that's the max I can go.

My 6V batteries are sealed AGMs, purchased from Sam's Club. I selected them because of the difficulty in monitoring fluid levels for my particular situation. My battery compartment originally had a slide-out tray for the lower profile 12Vs. I needed more height for 6Vs so the slide-out tray had to be replaced with a steel plate to gain enough height to get them to fit.

Shown here are the 6V AGMs installed.


Here were my original 12V batteries in the slide out tray. Removing the tray gained around 2" in height which made it work. The tray wouldn't hold two 6V batteries anyway. I would have had to buy a different tray.


AGMs require a higher output from the charger. Fortunately my whole-house RV inverter has a setting for AGM batteries. The instructions in the owners manual had me move a jumper on the side of it. My carry-along charger also has a setting for AGMs.

I understand AGM batteries can be placed on their side. That might help them fit where you need them. AGMs at Sam's Club were twice the price of their lead acid 6V batteries.