OER Parts offers a wide selection of Battery Accessories for your 1990 Mercury Topaz. OER Parts offers 1990 Mercury Topaz Battery Tender, 1990 Mercury Topaz Battery Managment System, 1990 Mercury Topaz Dual Battery System Controller Set, and 1990 Mercury Topaz Battery Relocation Set. Battery Mat Battery Topper Battery Terminal Protectors Battery Post Cleaning Brush Battery Terminal Puller