OER Parts offers a wide selection of Battery Accessories for your 2003 Chevrolet Blazer. OER Parts offers 2003 Chevrolet Blazer Battery Tender, 2003 Chevrolet Blazer Battery Managment System, 2003 Chevrolet Blazer Dual Battery System Controller Set, and 2003 Chevrolet Blazer Battery Relocation Set. Battery Mat Battery Topper Battery Terminal Protectors Battery Post Cleaning Brush Battery Terminal Puller