1. Computed based on typical classroom usage: device fully on (backlight at maximum brightness) half of the time, and idle (screen dimmed) the other half. The device draws 113 mA when fully backlit, and 36 mA when dimmed, which gives an average current of 74.5 mA. Given a 1620 mAh battery, this amounts to 21 hours and 45 minutes of use.
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