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Check the battery power
•Tap the battery level icon ( ) on the Today screen. The Power Settings screen will then open where you can see the current battery power level.
Battery power indicator
When the battery power gets very low, a warning message will be displayed. When you see this, immediately save your data by synchronizing with your PC, or save your data on a secondary storage card, and then turn off your device. Do not attempt to restart your device until you have connected it with the power adapter.