Yes, to power the mount. I'm going on family vacation and was going to buy a battery charger so figured why not get something I can use for more than one application.
I like the second one you posted. So, for astrophotography do you use both batteries listed? One to power mount and the other to power equipment? Or, do you just use the second one to power mount and all your equipment when you do astrophotography?
Mounts: ES PMC-8 Exos II
Scopes: ES 127ED
Cameras: ZWO ASI224MC, Canon Ti7
Controller: Dell Laptop with WIndows 10