OER Parts offers a wide selection of Battery Accessories for your 1956 Pontiac Chieftain. OER Parts offers 1956 Pontiac Chieftain Battery Tender, 1956 Pontiac Chieftain Battery Managment System, 1956 Pontiac Chieftain Dual Battery System Controller Set, and 1956 Pontiac Chieftain Battery Relocation Set. Battery Mat Battery Topper Battery Terminal Protectors Battery Post Cleaning Brush Battery Terminal Puller