Our motorcycle power adapter is a HELLA/DIN plug to USB, not a cigarette lighter socket in the car. The input voltage should be DC 12V-24V, suitable for Ducati/Triumph / motorcycles in European style.
12v din adapter has a 30W(Max) PD3.0 USB C port and an 18W QC3.0 USB A. The USB C port can quick charge most quick-charge phones and tablets such as the iPhone12 from 0 to 50 percent within 30 minutes.
Since the 12-volt battery has an internal resistance, and it can only display the voltage accurately if the USB is not charging. Voltmeter display range 9V-30V.