Lifeline AGM batteries must have a reduced upper voltage. They can handle 10x the amperage, but not high voltages. Some AGM batteries may not be this way, though. Lifeline batteries use cadmium, not antimony, for the lead alloy. This makes them physically very strong, and allows the high amps.Isn’t AGM charging voltage about the same as flooded lead acid batteries? Pretty sure it is. Current demands...now that is different.
Many persons get 8+ years from Lifeline batteries. Usually if they are deep cycled to 50%, the batteries last 700 cycles. If they are deep cycled to 30% they last over 1000 discharges from what I remember.