That's too bad that the battery isn't performing well. Strange, I thought reviewers said that battery life on the Pro model was decent? A 4500 mAh battery should function better. Hopefully an eventual update will fix battery performance.
Not sure what to expect , but for that size screen, I find the battery life decent, not impressive but ok, and it never really become a problem since it also charge very fast.
Though I think the battery easily gets very warm, I suspect that is normal with these batteries?