What are you trying to power? Just the mount? If so this is definitely overkill. I have 2 batteries.
The smaller one has enough juice to run the mount for several hours. The large one I use for my AP setup. The one you linked to doesn't appear to have a 12v port so you would need to plug in an AC power supply into the 3-prong outlet. It should work though.
Telescopes: Astrotech AT72ED II, Orion 8" Dobsonian, Tectron 15" Dobsonian
Camera: Canon T3i
Mount: iExos-100 PMC-8
Mount Control: Explorestars on a Lenovo Tab 2 A10-70F Android 6.0