AGM's did not last any longer than regular lead acid batts for me. The Lithium batt is holding up fantastic though.
Lithium starter batteries not a good match where I am - poorer cold weather performance, although basing that on web research not actual use.
My NOCO lithium jump starter won't work below zero - self protection settings shut it off. AGMs have worked into minus 15-20F range no problem, haven't tried colder recently.
