Better than the shield, if I go through a few batteries, I'm at about 85%...Shield would be dead or close to it... Shield was at about 80 before I even got off the ground
The Shield has a known issue with Android 7 of rapid battery drain. You can search for other threads about the issue. Rolling back to Android 6 can help. It definitely helped mine, but even with rolling it back, my battery drains about 1% every 2 minutes. Could just be because my battery is older now. I just use a phone now as I want to travel as compact as possible.
I did use the skyreat tablet holder when I was using the Shield. Worked well and was compact when collapsed. Skyreat Tablet Holder