The Lifeline GPL range of batteries are high performance, Mil-Spec and AGM deep cycle. Due to the lifeline battery's quality construction, they have 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 sulphuric acid leaks, no acid clean up, and more power in the same space when compared to conventional batteries.