Originally Posted by 86Scotty
Everyone thinks they need AGMs but I disagree. I used to buy them. I quit. They aren't worth the extra money for the slight difference in output and supposed longevity. I have bought a couple for interior layouts but I currently have two lead acids inside my rig right now from Batteries Plus and they haven't killed me yet (due to offgassing). I spend 24 hours a day in my van several days a week.
Really, why do you think you need AGMs?
For outside use the only downside of flooded vs AGM is that you need to keep the water level topped off in the flooded battery.
For inside use you have the above water level issue and a (relatively small) risk of explosion of out-gassed hydrogen.
We spend boatloads of time doing risk analyses when developing products; this typically involves 3 variables....severity, occurrence, and detectability.
In the case of hydrogen explosion, the severity is high but the occurrence and detectability are low.
..a few other trade-offs....
AGMs are more $$...as we all know
If you overcook a flooded battery and catch the problem early you can replace water for a chance at some more battery life.
Overcook an AGM and it vents........game over....AGMs are valve regulated lead acid (VRLA)..once the valve vents it's toast
Since AGMs are sealed you can mount them any any orientation.