To charge the battery, connect the Micro usb cable to Nexus 7
and to the charging unit, and the charging unit to a power outlet:
IMPorTAnT: use the charging unit and micro usb cable
that come with your Nexus 7. other charging units and usb
cables may charge more slowly or not at all.
The usb charging unit varies by country or region.
use only the usb charging unit that comes with your Nexus 7.
using a different charging unit may damage your tablet.
To avoid risk of injury or damaging your device, peel the pro-
tective film from the USB charging unit and USB cable before
charging the battery.
The input voltage range between the wall outlet and this
charging unit is AC 100V–240V, and the charging unit's output
voltage is dC 5V, 2A.
Your Nexus 7 can be charged via the usb port on a computer
Nexus 7 Guidebook