Chat services and their notifications will skyrocket usage times while draining battery slowly. These results are not atypical. His number one batter drainer was tapatalk. Number two was the lock screen.
To be very clear, these results are "slanted" due to the fact it was very "light" use. No GPS, no streaming music, just some moderate game playing, web browsing and Tapatalking.
The lock screen was a HUGE battery suck, which was very interesting to see. Another reason I think an LED notification would be a great idea for the phones, but that thread was closed long ago.
Overall, my phone will typically get around 11 - 12 hours of "heavy" use with around 30 hours of standby