OER Parts offers a wide selection of Battery Accessories for your 1966 Plymouth Belvedere. OER Parts offers 1966 Plymouth Belvedere Battery Tender, 1966 Plymouth Belvedere Battery Managment System, 1966 Plymouth Belvedere Dual Battery System Controller Set, and 1966 Plymouth Belvedere Battery Relocation Set. Battery Mat Battery Topper Battery Terminal Protectors Battery Post Cleaning Brush Battery Terminal Puller