100lb AGMs sound like 4Ds Some of those can be 200AH, while my 8D at 150 lbs is rated 250AH. AGMs except Lifeline seem to have spec max charging at about 30% charging rate. So 50 amps on 150AH works.
I had the 100AH AGMS for a year before they got in this MH and for the two years since they have been recharged per Mex's rules (20% bulk, 0.5/100) The 8D was second hand so I don't have its history. It has worked ok for a year until this started.
It seems to arise from repeated high amp draws where heat must build up inside and warps or cracks the plates somewhat. One high amp run I can get away with, maybe--we'll learn more about that when next out camping.
The mix of 27s with these AGMs is a quick-fix attempt to get more time with these AGMs before I have to get a new battery set. One of these days I will have four new batteries all the same, and have no more trouble :)
