I have purchased the 3800 may battery,  it does help, i was getting 4 hours prior to change out of battery, Now I'm getting through the day. 
Keep in mind, i use bluetooth, wireless, netflix, and other apps frequently through the day. the display seems to use most of the battery resources in my opinion.
I have had the phone as of the post for 3 weeks and  have another week for evaluation. think I'm keeping it dispute the battery issue,