This battery will deliver more power and significantly better shelf life than traditional VRLA batteries. Developed in-house by the engineering team at Gill Battery, a subsidiary of Teledyne Technologies, Inc. and thoroughly tested by an independent test and measurement firm, the 7639-27 employs an optimal Lead alloy to enable the best possible performance in this chemistry. The 7639-27 is also FAA and PMA certified. The benefit to aircraft owners and maintenance facilities is a new sealed, VRLA battery that provides exceptional power and previously unheard of shelf life as well as excellent durability and reliability. Weight: 60 lbs.