IPhone 4S Battery?

Hey guys
I just wanna check if my battery is good or nuh..

Usage :6 hrs 12 mins
Standby: 12 hrs 7 Mins
iPhone 4S
iOS 7 beta 4

Used 3G for 30 mins for browsing and played songs for 10 mins
And the whole remaining usage time was for WIFI Facebook , Whatsapp , Instagram Etc..
So is it good or what ?
Thanks :)..