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Check the battery power
Tap Start > Settings > Systems tab > Power. The Power Settings screen will then open where you can see the current battery power level.
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.
To install the microSD™ card
If you need more storage for your device, you can use a microSDTM card (not included) to save media and other files.
1.Pry open the rubber cover at the
2.Insert the microSD card with the gold contacts facing up.
3.Close the rubber cover.