To charge the battery, plug one end of the power adapter into the power port on your Chromebook and the other end into a power outlet.
When your Chromebook is plugged in, the charge indicator light indicates the status of your battery. Refer to the image below to locate your indicator lights.
For more information about charging and checking the remaining power of your Chromebook, please visit Google's About your Chromebook's battery page.
For more information, visit the Chrome OS Help Center.