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My car has 2 USB-C ports and I bought a UGreen USB-C to USB-A adapter to use it with USB-A flash drives and my phone (which has a micro-USB port) via a USB-A to micro-USB cable.

These USB-C ports seem to provide current even with the engine off.

As I would like, for convenience, to have the adapter always connected to the USB-C port, is there a chance that this adapter draws power even without a device or my USB-A to micro-USB cable connected to it and thus affect the car battery?

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  • That one looks basic, but there are some crazy complicated cables around (usually very over-engineered and overpriced imo ;-) A USB power meter / USB digital tester could say for sure
    – Xen2050
    Commented yesterday

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It's a passive adapter (no converter chip, just two connectors wired together), so it doesn't need to draw power in general.

(It does have a single resistor on the 'CC' line on the USB-C end, acting as an indicator to the USB-C port that it should supply power at a certain voltage – I don't exactly understand how the circuitry works, but as far I understand from the Type-C specification and other sources, the amount of current that is used for sensing would take over 30 years to drain a car battery.)

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