Dell Venue 8 7000 Series User Manual page 10

NOTE: A fully discharged battery takes up to 4 hours to fully
charge.
NOTE: You can also trickle charge the tablet via a computer's
USB port using the micro‑USB cable. When connected to
a computer, the battery charges slowly as the charge time
depends on the power output of the USB port. The tablet may
not charge if it is connected to a computer that is turned off or in
sleep mode, to a USB hub, or to the USB port of a keyboard.
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