Android updates begin as a lottery, every time your phone checks for one, there is a slowly increasing chance over time that it will get it, until eventually it is 100%. There is also a limit to how many times your device can check per day (I think it's 2 or 3).Originally posted by JRSC00LUDE
How come I haven't got it yet?! Also I can't get through a day on a full battery. Do I use it that much?!
Marshmallow may have made this unnecessary, but one thing you can do that makes a significant difference is put your location settings on Battery Saver mode. You will only have to take it out if you need to use full-on navigation, and it takes 2 seconds to toggle. Apps constantly activating your GPS is hard on the battery, moreso on older phones.