Thanks all. I agree AGM's do not vent under any but abnormal circumstances such as a serious overcharge or they get overheated by a high charge rate. The small amount of gas they may produce in these instances isn't a worry. I think I will box them though just because they are in a location where careless handling of a conducting item may cause a short. Since I don't intend to mix the battery types I will remove the existing and stay with the two AGM's. Looks like I have a brand new deep cycle battery for the emergency lighting at the stick house.
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