AGM batteries can offgas if charged too fast or over charged. They’re valve regulated in order to release the excess hydrogen gas.
To the Op:
Unless you want to change the cabling or need additional capacity, the simplest route is to look at the batteries you currently have and replace them with the same configuration. For example if you have two 12 volt 100 amp hour deep cycle batteries, replace them with the same. If you have room, you could replace the two 12 volt batteries with four 6 volt batteries wired in series/parallel, but again that would require changing the cable configuration.
Costco, Sams Club, Walmart are good for inexpensive flooded or AGM deep cycle batteries.
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Bill
2014 Newmar Ventana 4037, XCR Tag Axle, Cummins ISL, All-electric
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