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Misc Setting
Battery backup (Option for N7 with backup battery):
When turn on this function, system will enter sleep mode and use
battery backup if you remove back cover, and you can change main battery safely without worrying about losing data. After
you finish change battery and close the back cover, system return to normal mode.
Tap the app icon
and then
“System” -> “Misc Setting” -> tap “Battery backup (close)” and then turn on / off this function
per your needs.