Does this look like normal Lollipop 5.0 Battery life?

[chadhindsley]

Hello,

former Apple user here. Just bought a used Galaxy S5 yesterday (2 months old).
I was hoping it would have 4.4.4 but it already had 5.0 loaded .
I took some screenshots of the 50% mark and want to know if this is pretty standard for 5.0.
Couple of other questions:
-Verizon has 5.1.1, but when I press search for updates it already tells me I have the most recent update (5.0)
-If I downgrade to kitkit 4.4.4, will battery life improve and will Verizon still continue service with me?

Thanks!