The JBL Charge 4 speaker has a group of LEDs across its lower front panel. These display battery fullness and charging status. In brief, the JBL Charge 4 Charging Indicator displays charging progress, and how full the battery is when not charging. JBL Charge 4 Charging Indicator: How to Read These Lights 1. All Lamps … Continue reading JBL Charge 4 Charging Indicator