OER Parts offers a wide selection of Battery Accessories for your 2007 GMC Sierra 3500 Classic. OER Parts offers 2007 GMC Sierra 3500 Classic Battery Tender, 2007 GMC Sierra 3500 Classic Battery Managment System, 2007 GMC Sierra 3500 Classic Dual Battery System Controller Set, and 2007 GMC Sierra 3500 Classic Battery Relocation Set. Battery Mat Battery Topper Battery Terminal Protectors Battery Post Cleaning Brush Battery Terminal Puller