OER Parts offers a wide selection of Battery Accessories for your 1971 Cadillac Calais. OER Parts offers 1971 Cadillac Calais Battery Tender, 1971 Cadillac Calais Battery Managment System, 1971 Cadillac Calais Dual Battery System Controller Set, and 1971 Cadillac Calais Battery Relocation Set. Battery Mat Battery Topper Battery Terminal Protectors Battery Post Cleaning Brush Battery Terminal Puller