Ya know, it seems for me release 3 was improved and 4 went backwards on battery. Limited time on this release but my first impression is that 4 is slightly worse than 3 but better than 2.
yeah man. I had the same thing happen. my battery life was good in update 2 but went worse on 3 and hasn't improved in 4. Thanks for sharing your situation. hopefully they fix this in the final version