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I do not work for Tesla; I am not a mechanic; I am not promoting doing this; do at your own risk:
I have a 2016 Model S P90D. I installed the quick connect cable directly to the 12v battery (purchased on amazon called, "SPARKING 6FT Ring Terminal Cable - SAE to O Ring Terminal Harness Quick...
12vbattery12vbattery charging
2016 tesla model s 12vbattery charging
battery storage
batterytender to 12vbatterybattery tendor
car storage
model s 12vbatteryms12vbatterytender
trickle charging