Autometer Battery Extender - 12V / 3A (BEX-3000) YMM_2005_2007_Mercury_Mariner_I with reduced play and more

with reduced play and more direct control

Simply hang it from your vehicle's rearview mirror

while the textured surface provides improved grip for confident handling

all while maintaining ride comfort and stability

Autometer Battery Extender - 12V / 3A (BEX-3000) YMM_2005_2007_Mercury_Mariner_I with reduced play and more12V 3A Battery Extender by Autometer These Battery Extenders from AutoMeter are designed to maximize the life of a 12V battery. They charge a battery at a 3 amp rate until it is fully charged, and then maintain your battery's charge so that it is always ready to go! Features Battery extenders keep your battery at full charge on a continuous basis. Batteries not kept at full charge become sulfated. Maintain stored batteries at full charge to maximize