The plates in AGM golf car batteries are exactly the same thickness as in their group 24, 27, and 31 BCI regular batteries. To upgrade thickness and lifespan the Lifeline battery plates are almost twice as thick as Trojan, Full River, yadda yadda.
No less often than once 2 - 3 weeks the AGM batteries must be fully meaning 100% recharged. Download and read the free Concord Lifeline PDF user guide. Your existing charger is semi effective on batteries that never get unhooked from a power pedestal. BFL13 has a good lead on an inexpensive charger that will work fine with any AGM and it can stand separate from your existing converter. Why disconnect and replace? Clamp on two battery charger clips, plug it in and away you go. At home charge the batteries fully then put the charger away. The existing perverter will work fine as a battery float maintainer. But without assistance it will eventually destroy any AGM battery regardless of make.