You don't know how much I wish I didn't update. I used to get decent battery life as the built in stamina mode would cut off the internet from any app unless I selected it not to. This used to happen pretty much instantly when the screen was turned off, and there was also an option to keep the phone asleep when you used it to look at the clock. Now thanks to marshmallow doze this has gone. And what did they replace it with. The exact same thing (minus being able to look at the time) except that it takes 10 to 15 minutes to kick in after your phone been perfectly still. Now how does that work when I'm working. The only time my phone stays still for 10 minutes is when I'm at home and could put out on charge anyway. I'm getting home from work with about 20% less battery. Thanks google. Here's hoping Sony bring back stamina.