Both my chassis batteries are bad. They got discharged and they won't take a charge anymore. When I bought the RV, the previous owner had just replaced the chassis batteries with these, and from what I'm told they're really low quality batteries. They're date coded October, 2019. I'm thinking they should have lasted longer than this, but again they're really low quality batteries.
My problem is they're not labeled with a size. I've asked Newmar via email since they never answered the phone and I haven't heard back from them. Does anyone with this era Newmar DP know what size batteries are in there? Or, can anyone tell by looking at these what size they are?
Is there any reason to go with AGM? The 6v house batteries in there are wet cell, so there's no keeping the battery compartment cleaner benefit to going AGM in that respect. Other than keeping the battery compartment cleaner, is there an operational benefit to AGM's?
I'm thinking by appearance they seem to be this size:
Is size 31 common in this application?