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
Weiss More Power Battery for JBL Flip 4, JBL Flip 4 Special Edition Bluetooth Box, 3000 mAh, 3.7 V Lithium Polymer Replacement Battery for JBL Portable Speaker Compatible with GSP872693 01, Rechargeable