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