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1.5 Amp, 6/12V On-Board Battery Maintainer
Schumacher Electric Schumacher Automotive 6-Volt/12-Volt 1.5-Amp Battery Maintainer with Auto Voltage Detection and Quick-Connect Harness SC1319 - The Home Depot
Vector 1.5 Amp 6/12 Volt Battery Charger and Maintainer BM315V