Plug a micro-sized USB cable into the guitar's USB port. The port is located on the lower right side of the guitar. The other end of that USB cable can then be plugged into either a USB wall charger or a computer's USB port.
When the guitar is connected to power the 5th fret battery level LEDs will light up continuously for 3 seconds and then turn off. Even when the battery is fully depleted, one LED will light on 5th fret. When fully charged it will show 6 LEDs.