I just got the .29 update and see no improvements to battery time whatsoever. If anything, things are even worse generally, with Windows Hello dying on me constantly now. Oh, and the phone just rebooted by itself last night.
/ David
PS. For those interested in what I am struggling with when I'm not recharging my phone, have a look at my OneDrive woes. Good thing it didn't cost like an iPhone. /s