To answer the question: How Do I Know When My JBL Charge 5 Is Fully Charged ? First, check that your USB charger is big enough to do the job. Details below. Next, check all connections for trueness. So Connect the black USB-C cable that comes with the speaker between the Charge 5 and charger. … Continue reading How Do I Know When My JBL Charge 5 Is Fully Charged