You guys are waaay ahead of my reading on this stuff but.…my understanding is….starter batteries have thin plates (less lead by design) for fast short duration shallow discharge power. House batteries have thick plates (more lead by design) for slow long duration deep discharge power. Marine batteries are bastards of both with plate thickness in the middle which compromises both sides of use.
For example……….that 100amp AGM 12v Stark pushes less than 900 cycles at 50%...10.7lbs a cell…..my 260amp wet 6v Crown claims 1200 cycles at 50%...25lbs a cell. Car batteries seem to only rate CCA and are maybe 2 lbs a cell.
So splain me what’s goin’ on or point me to a thread so you don’t have to rehash. :-)