The very friendly and helpful support gave me the following specs: 2.8mm OD/0.65mm ID, length 9mm.

On AliExpress I can only find USB to DC cables with 2.5mm/0.7mm which I guess should work. I ordered two cables and will try it out.

I guess in the 2.8x9mm specs the 9mm is for the length. But none of the specification seems to match standard size as per https://en.wikipedia.org/wiki/Coaxial_power_connector

I sent a request to support and they seem to answer quickly. I'll update this thread once I got definitive answer from them.

USB is ubiquitous. And power banks free yourself from the need to have a socket nearby.

What I can definitely say is that the plug is not 5.5mm by 2.1mm. It is smaller.

And yes - I also found very different answers to this question. That is why I thought asking experts would be a good idea

Hi,

Did anyone try to power the E1 Pro from USB.

Unfortunately it has a barrel connector but is powered by 5V/1A which means it should easily run off of a USB power source. Does anyone know the barrel connector specs?

Thanks!