The fat charger heating up the phone isn't going to change, however, if your battery life isn't better you have a Rouge app problem, etc, as 95 out of 100 people are having battery battery lifeI did the update yesterday and only thing I've noticed is that battery drains faster than it before. Still runs hot when charging with fast charger. Other than that, seems to run faster. I like that the fingerprint security is faster when I touch the button.