AGM Batteries per Google's "I'm feeling lucky" gives a decent rundown. In a nutshell it is a sealed very durable fast charge/discharge battery.
My only concern is that given an AGM batteries low internal resistance, you might run into the problem where the all of your starting current comes from the AGM instead of your lead acid battery. This would lead to much shorter lifetime if it didn't have the capacity.
Quote:
Originally Posted by herring
What I'd like is a diesel-fired block heater with a timer.
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Espar makes them. I can get you a
Hydronic 4 with 7 day timer for about $1200 right now.