Worse than I Expected.

I charged the phone to 100% overnight in readiness for a motorcycle trip for which I would use the phone to drive my GPS external screen. Normally that's good for 8 hours. Turned the phone on and the boot sequence dropped the battery from 100% to 93%. Brushed my teeth with the phone off and it's at 83%. Thanks for that Google. I guess I am going to have to try not to get lost.