Follow these instructions that show how JBL Charge 4 charging via its hidden DC input charging USB-C port, discussed below. JBL Charge 4 Charging First Remarks First, we suggest that you recharge the JBL Charge 4 with a full power USB 2.0 charger such as the JBL USB charger for Bluetooth speakers, sold separately. … Continue reading JBL Charge 4 Charging Instructions