Original URL: http://android.tgbus.com/shouji/news/201311/481145.shtml
Today, most Android devices, third-party ROMs can accurately display the remaining power in percentages in the status bar, and many software can do this, but native Android has not had this very basic little feature until Android 4.4.
It has been found that the power remaining xx% is already visible on the Nexus 5 and does not require root, but it is not turned on by default and is hidden deep and requires the following command to be executed via ADB:
adb shell content Insert--uri content://settings/system--bind name:s:status_bar_show_battery_percent--bind value:i:1
ADB reboot
After the reboot, a percentage number appears on the flat battery icon in the status bar, but it is white, which means you can only see it when the battery is below 40%!
"Go" without root Android 4.4 now supports display power percentage