OER Parts offers a wide selection of Battery Accessories for your 2012 GMC Truck. OER Parts offers 2012 GMC Truck Battery Tender, 2012 GMC Truck Battery Managment System, 2012 GMC Truck Dual Battery System Controller Set, and 2012 GMC Truck Battery Relocation Set. Battery Mat Battery Topper Battery Terminal Protectors Battery Post Cleaning Brush Battery Terminal Puller