I connected the BatteryTender extension line to my batter and ran it down the front trunk and out underneath the front of the radiator. The line easily tucks back into the tray in the front valance. When I want to use it, I simply pull the extension out and plug it into the other end connected to the BT device. I never leave it plugged into the BT when the BT is not live. Not sure what the point of doing that is since the BT is supposed to be live all the time. I have had this BT now for 20 years and it retains a battery for like 10 years. When the car is not driving, it is plugged into the live BT. and yes, you must remember to unplug the car and turn the BT off before driving the car.
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