OER Parts offers a wide selection of Battery Accessories for your 1971 Mercury Montego. OER Parts offers 1971 Mercury Montego Battery Tender, 1971 Mercury Montego Battery Managment System, 1971 Mercury Montego Dual Battery System Controller Set, and 1971 Mercury Montego Battery Relocation Set. Battery Mat Battery Topper Battery Terminal Protectors Battery Post Cleaning Brush Battery Terminal Puller