Previuosly I wasnt that impressed with this to start.  The screen brightness was constantly fluctuating.  There was a hidden setting in advanced power settings go to display and enable adaptive brightness. double click and select off.
I also use them for reading Kindle and Kobo books.  This has nothing to do with Acer so not blaming them but you cant read books on either app that came from another source. Can only read what you have bought. where with the android apps you can read books from elsewhere.
So far reading ebooks and surfing the net I consistently get around 9 hours battery life.
The screen is bright but not as reflective as the Asus transformer so I find it better to read on without the distracting reflections