^^ I'm sorry to hear about the defective unit (pixels and battery life).
I charged mine fully the night of the 4th when I got it, set it all up and then couldn't get it activated so I put it on Wifi until I activated the phone on Metro last night (the 5th) around 7pm. I used the phone actively, texting, reading, websites, feedly, setting up light flow, taking a bunch of pics etc until about 1am last night. Here I am after my commute to work about 35 total hours since I last charged the device and it's running at 52% battery left. I'm really pleased even though it's unique usage because of the delayed activation.
One thing I did do from the beginning is go into Settings, Location and turn the mode onto "battery saving" which doesn't use GPS as much. (I think this is new for kitkat. Anyways, I have client meetings all over the city today so I'll report back with how GPS fairs on this setting.