GoPro Hero 3+ Quick Manual page 8

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There is also a Battery BacPac in case
you need to extend your recording time.
It is mounted on the back of the camera
and doubles the operation time. It needs
a special housing (that comes with the
kit) and should be charge through its
own Usb port.
Power
The camera kit comes with a battery
that runs the camera recording
continuously for 100min (around 2.5h
shooting Time-Lapse and around 3.5h
in Stand By) and takes about 120min
to fully charge. To charge the battery
connect the camera to your computer
using the Usb cable, the red front led
will remain On while charging.
Separately you can buy the Mains
Adaptor to charge the battery when a
computer is not available.
Also separately there is a Dual
Charger to charge 2 batteries
simultaneously connecting it to
your computer, or to the mains if
you have the Mains Adaptor.