Gives the JBL Wonderboom 1 battery check routine, and also, how to know if the battery life is shortening over time. JBL Wonderboom 1 Battery Check: Step by Step 1. First, Turn ON the JBL Wonderboom 1 You won’t be able to read battery charge status unless the speaker is ON. To turn on the … Continue reading JBL Wonderboom 1 Battery Check