What power cord to use from external battery pack to GL-X750

I just bought a GL-X750V2 to use outside my home in a remote are because it supports band 71. I like to know what barrel connector size I need on the end that fits into the router. I already have a rechargeable external battery pack that has a
5.5mm X 2.1mm plug.

You will need an apprpriate cable to connect to the barrel connector on your X750.

The correct size is: 4.0mm*1.7mm

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Wow that was quick. Thanks a lot sir