I'm using a Macbook Pro 15" 2018 model. I want to use wired Internet connection with it. I've tried using 2 different USB-C hubs to accomplish this, both are USB-C to Ethernet plus some USB-A 3.0 ports (SD card reader slots on one of them). They both drained the battery life on my Mac by a lot, like roughly halved it or so even though I only used the Ethernet port on them.

Today I also got a pure USB-C to Ethernet adapter (not a hub). It seems to not drain the battery as much as the hubs but still has the same problem. I was hoping it would be better and I'll test it some more tomorrow.

The thing is that without the Internet connection through a USB-C to Ethernet port the battery life is just fine. It seems that it's as good as advertised, actually, more like 10 hours or so. I haven't done a real test to see how long it actually lasts before it shuts down, but it's still significantly better. Even Wi-Fi seems to use less power than USB-C to Ethernet.

Does anyone know a solution to this? Are USB-C to Ethernet connections on Mac bound to drain battery? Or could it be a software issue? I've tried searching the Internet a lot for a fix but it seems like a lot of people don't even have this problem with these kinds of adapters.

Thank you so much for any help, and kindest regards.

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