Amazon.com: High Capacity Replacement Battery + Tool for JBL Flip 4 Speaker or Special Edition Model GSP872693 Li-Polymer 3.70V 3000mAh/11.10Wh Repair Power : Electronics
How to Replace Your JBL Flip 4 Battery - YouTube
JBL Flip 4 Replacement Parts Board/Ports/Battery/Speaker/Grill/Cover/Radiator | eBay