The Lifeline GPL-31T is a high performance, Mil-Spec, AGM deep cycle battery. Due to the Lifeline Battery's quality construction, it has an industry leading 2% per month self discharge rate at 77°F (25°C), compared to 10%+ for conventional batteries. The AGM technology allows for a completely sealed maintenance-free battery with no sulfuric acid leaks, no acid clean up, and more power in the same space when compared to conventional batteries. The Concorde Battery Corporation is the manufacturer of Lifeline batteries; a pioneer of the AGM technology since 1972.
The Lifeline GPL-31T is a direct replacement for any group 31 lead-acid, GEL, or AGM batteries.