Join Date: Apr 2018
Location: Hannover, Germany
If the USB-charger (12v to 5v) is connected direct to the battery it shall drain your battery. Therefore my USB is linked to a cable with no power if the ignition is off. Yesterday done so by BMW in Hannover. If directly to connect to the battery chose an USB with a switch.
Last edited by Jaeng; 04-21-2018 at 08:25 AM.