They are indeed Group 27 Batteries. The Group 27 refers to physical size of the batteries as well as the electrical characteristics.
There are basically three types of batteries.
First is a Starting Battery. This is what you have under the hood to start the engine. They offer high amps (Cold Cranking Amps or CCA’s) for a relatively short time in order to turn an engine over when starting. They don’t have a very high reserve capacity and will not recover if drained too low, too often. Second is a hybrid commonly referred to as a Marine or RV Battery. These too will offer a rated Cold Cranking Amp rating and an Amp Hour reserve capacity. They are intended to start a Marine Engine and run a trolling electric motor as well. They can handle more draining than a starting battery but not nearly as much as a Deep Cycle. The Last is really what you want for coach batteries and they are a True Deep cycle Battery. These are list listed with a Reserve Amp Hour Ratings. These are intended to be more deeply “drained” and the recharged. They can be use to start a Generator as well.
There are several Deep Cycle Batteries. Most Common are Flooded (wet) that require periodically checking the fluid (acid) levels in the batteries. These are what your Exide’s are. Exide’s nominally are 85 to 90 Amp Hour Batteries (each). You did check the fluid levels right? These are the least expensive Batteries. Trojan, and Deka are preferred Wet Battery mfg’s
Next is an AGM (absorbed glass mat) Battery which is a special design glass mat designed to wick the battery electrolyte between the battery plates. They are for the most part, sealed, non spillable, deep cycle, may be mounted in any position, low self discharge, and are safer for use in limited ventilation areas. These are pretty much maintenance free. They don’t have to be removed from the coach in the winter to prevent freezing like a wet cell battery does. Of Course, these are more expensive.
I am using two Lifeline Group 27 AGM Batteries Click HERE
in my Forester. My last RV was a Lance Truck Camper that used a single Lifeline Battery that lasted me ten years of mostly dry camping with a 70W solar panel (I think I “Plugged in" a total of 5 times in the ten years)
The Lifelines made a believer out of me as I never ran out of power when in use and I am expecting them to last a very long time. I paid $270 each to my door online.
The Fuse Panel that ATVer is referring to is located in the step well and looks like this, Click HERE