How do I turn on battery percentage in Android Lollipop? I haven't been able to find a menu option for this setting in Android Lollipop (previously known as Android-L).
This website has a good page on the information:

http://nexus7.wonderhowto.com/how-to/unlock-android-ls-hidden-battery-percentage-icon-status-bar-0155876/

But if you want a quick and dirty way to enable this, you can just use:

adb shell content insert --uri content://settings/system --bind name:s:status_bar_show_battery_percent --bind value:i:1


followed by 

adb reboot