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