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