Iphone 6 battery life concern

[Femme]

The first month of using this phone I was really impressed with the battery life. Didn't need to take my charger with me for the day. However, I've been noticing that the battery is dying faster than before. Can anyone tell me if I'm just overthinking or are my concerns normal? Here's a pic of my usage. 3 hours of continuos browsing (I have a test to study for therefore, of course, I'll be on my phone instead) and almost 50% dead.

 

[Damolee]

You will prob end up with 7-8 hrs usage.

That is right for an iPhone 6. Average of 5-6 hours "screen on" time.