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Underbody Lights and 12v battery issue

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Had these installed 3 weeks ago and this weekend the 12v battery started dying. Anyone else have this issue?
Tesla service came out and replaced battery but also disconnected the kit and said nothing should be connected direct to the 12v battery else it will occur again. Said going to cigarette light for power is fine or even better to convert to usb and connect that way...
 
If the lighting system doesn't go to sleep with the car, it will undoubtedly draw current from the 12v battery. The reason why the tech is telling you to connect to a USB port/cig lighter is because it works in conjunction with the sleep/wake event of the main system that prevents said activity.
 
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If the lighting system doesn't go to sleep with the car, it will undoubtedly draw current from the 12v battery. The reason why the tech is telling you to connect to a USB port/cig lighter is because it works in conjunction with the sleep/wake event of the main system that prevents said activity.
Mine is controlled via bluetooth and is always off before i close app etc.