Note: This article refers to the BOOMSTER (2020), sold from 2017 to 2021. This model has a down-fire subwoofer.
Please check the battery disconnect switch on the back.
This disconnect switch prevents the BOOMSTER (2020) from being accidentally turned on. The button must be switched on (protruding position) for battery operation and charging at the power connection.
If the battery mode still does not work, please contact our customer service.