JETSON TX2 power cable

Hello everyone, I want to hook the Jetson TX2 up to a battery on our mobile robot. I don’t want to cut the one that came with it as I still want to be able to connect it to a wall.

What are the exact dimensions of pigtail power cord? Is it 2.1mm by 2.5mm? Such as this one:

https://www.amazon.ca/EKYLIN-DC2-1MM-Pigtail-Rearview-Monitor/dp/B071XP421R/ref=sr_1_26_sspa?s=electronics&ie=UTF8&qid=1510330382&sr=1-26-spons&keywords=12+6A+power+cable&psc=1

I believe that it is 2.5mm ID, 5.5mm OD