The first time you use your SoundLink® speaker, connect it to AC (mains) power and charge the battery for three hours. While the battery is charging, you can begin using the speaker.
To connect to AC power, follow these steps:
Depending on your AC power supply type, extend the prongs from the AC power supply,
or slide the AC power adapter for your region onto the AC power supply
Plug the power cable on the AC power supply into the DC connector on the back of the speaker
Plug the AC power supply into a live AC (mains) outlet. The speaker emits a tone to confirm connection to AC power, and charging begins. On the front of the speaker, the battery status indicator blinks yellow to show that the battery is charging