The ones near me didn't have them. I would like to get at least 4.5 hours plus sot. In the turbo forum people seem to think the battery is get better for them after the first week or so.
Battery usually does get better over time, new out the box you are going to use it more often than you will a month later as the new wears off.. Most reviews I've read say the Nexus 6 gets between 3 - 5 hours of screen on time and all have the same disclaimer that "your results may differ" Depends on how you use it and what is running when you have the screen on... web browsing on WiFi is going to get better battery life vs playing a 3D high intense graphics game while in a weak signal area....
the Nexus 5 has what I would call below average battery life.... but I work behind a desk 9 hours a day so I keep it on the wireless charger probably 1/2 the day... but I couldn't even come close to going from getting out of bed until getting home from work on a single charge.... So in that regard from what I am reading this should be an amazing upgrade...