Originally Posted by flocktothewall
In the MBS forum I believe there is a post about using group 31agm batteries instead of group 27 batteries. You'll get more AH and they fit in the battery box (snugly).
I myself did this but the batteries I bought (Sam's Club) were garbage. I returned them and had to exchange them for group 27's - or lose my core charge credits. Next time I replace I'll go back to the group31 but not from Sams.
I am still in the process of finding a place to give me a write up that the battery is indeed bad. In the mean time I got lucky and found a new EXIDE 27MDP. Believe it or not my local Home Depot now has an automotive section and they carry the Exide Marine Batteries for $65 plus a $12 core charge that is refundable by returning the old core. They also carry the EXIDE 31MDP for $100. The 27MDP is a 100 AH battery while the 31 MDP is a 125 AH battery. Yes they will fit but snugly. I suppose if I were into boondocking, I would consider adding the additional 12 pounds worth of batteries for the extra 50 AH they would give me but we have a generator that will charge the batteries If we dry camp longer than a couple days.
As far as the AGM batteries go. I am no expert by any means, BUT, from what I have read on other threads, the AGM Batteries are NOT a deep cycle battery and therefore inferior when it comes to using them as storage batteries for long term low amperage usage.
Make sure you take the time to research the difference between the two battery types, I am sure there are many threads on this site that discuss the pros and cons of each type.
BTW, It is my opinion that the battery in question was BAD when installed by the Forest River employees. There is a hole in the bottom of the battery that allowed the acid from one cell to leak out and there was no debris under the battery that could have caused the hole. The battery had been leaking acid for such a long time that it actually etched away some of the battery case metal directly under the hole.
The first two pictures show the dry cell and the hole in the battery.
I added the third picture because I wanted fellow owners to check their battery connections. Specifically the two wires that are attached to top of the fuses block/circuitbreakers mounted on the wall above the batteries.
On my motorhome, the left red wire was only making a partial connection due to half of the wire terminal being covered with shrink tube. Whoever installed the shrink tube forgot to cut the excess off of the terminal blade. due to this only half of the blade actually contacted the connection surface.
The right red wire was mounted facing the wrong direction. The fuse holder had a divider on the left side of the terminal that sticks out almost 1/4". due to this the wire terminal was sticking out on an angle instead of being flat against the contact surface so I was actually lucky that, I didn't use the battery power to the extent that the connection would have overheated due to the lack of contact surface area. The wire itself needs to come in from the right so that it will sit flat on the contact area.