AGM batteries are indeed deep cycle batteries, and great ones at that. I used 60 (yes 60) of them at a time as emergency back up power for emergency back up power for a 9-1-1 system. Only the best would do.
I used them in my boats too and loved them. The technicians described them as trolling motor batteries on steroids! Lol
lndeed someone damaged your battery when they punched that hole in it.
Cedar Creek Lake, Texas
2016 Wildwood Xlite 171 RBXL
2016 Ram 5.7L crewcab, 8 speed transmission