The JBL Boombox 1 charging indicator is a row of LEDs across the lower front panel. These display battery fullness and charging status. In short, this indicator shows how full the battery is whether charging or not. JBL Boombox 1 Charging Indicator: How to Read the Lights 1. All LEDs OFF When you power down … Continue reading JBL Boombox 1 Charging Indicator