LifeLine batteries are manufactured to the highest standards in the industry. They are assembled utilizing the same methods and procedures as Concorde's world famous aerospace grade batteries. This technology combines basic absorbent glass mat (AGM) principles with other patented procedures and special materials. "LIFELINE" batteries are hand assembled using special interlocking cases which are sealed with epoxy resin.  Once fully charged and drained, the cells are charged to a slight positive pressure. They have superior strength, do not leak while inverted, and internally process charging gasses.  Lifeline batteries have a 5-year pro-rated warranty with a 1-year free replacement (12-month prorated warranty in applications other than marine or RV).  The quality and durability of the Lifeline battery series has been proven again and again in military and commercial applications worldwide.