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