^Which is why I bought the Mighty Max ( there are other same size different branded).
It is only 200ah vs 225-240 of true GC batteries but same advantages as GCs and just as much power as 2 group 27s.
Cost, $190-200 ea for Agm vs good group 27s flooded which are $150-180 and 27 AGMs which are $250-350.
Unless they don’t last, they hit the sweet spot for compact size, storage capacity, Agm and price. And it don’t cost anything to switch over. (I did have to build a jumper wire as the ones from the 12V setup were a bit too short.)
Only a 1 year warranty, but 10 year design life.