Using Your Tablet; Charging Your Tablet - Acer iconia one 7 User Manual

Charging your tablet

For first-time use, you need to charge your tablet for four hours. After
that you can recharge the battery as needed.
Note
Charger illustration is for reference only. Actual configuration may vary.
Assembling the power adapter
Slide the large end of the USB cable into the power adapter body (it
will fit in only one direction).
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Using your tablet - 7