OER Parts offers a wide selection of Battery Accessories for your 1981 Cadillac Fleetwood. OER Parts offers 1981 Cadillac Fleetwood Battery Tender, 1981 Cadillac Fleetwood Battery Managment System, 1981 Cadillac Fleetwood Dual Battery System Controller Set, and 1981 Cadillac Fleetwood Battery Relocation Set. Battery Mat Battery Topper Battery Terminal Protectors Battery Post Cleaning Brush Battery Terminal Puller