[mhogomchungu]

How do you measure battery life?

1. Do you charge it to 100% and live it alone until charge goes to 0%?

2. Do you unplug it in the morning and use it "normally" and see what charge will be left when you put it again on a charger when you go to sleep?

Different use cases drains battery at a different rate and its hard to use a new phone/a phone with a new OS "normally" because more time than usual will go into trying to understand it.

It may also happen that you start using the phone at a time when your phone usable is above your average.

[oelmekki]

I have a daily routine, always charging my phone at the same time, always using it at the same time. If after an update I notice the day after my battery is drained one hour before the usual time, it sounds pretty safe to assume the update did something regarding it.

But I won't decide I know for sure it's a problem for everybody, obviously (which doesn't mean either it isn't).

EDIT: but as philjohn mentioned, you can expect to use your phone more after an update (especially a major release) to try new features and because of renewed interest.