OER Parts offers a wide selection of Battery Accessories for your 1973 Buick Regal. OER Parts offers 1973 Buick Regal Battery Tender, 1973 Buick Regal Battery Managment System, 1973 Buick Regal Dual Battery System Controller Set, and 1973 Buick Regal Battery Relocation Set. Battery Mat Battery Topper Battery Terminal Protectors Battery Post Cleaning Brush Battery Terminal Puller