Amazon.com: WirelessFinest 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
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Amazon.com: MPF Products 3000mAh GSP872693 01 Battery Replacement Compatible with JBL Flip 4 and Flip 4 Special Edition Waterproof Portable Bluetooth Stereo Speaker : Electronics
Newell MY-JMF310SL for Flip 4 Battery - Newell Pro - Camera Batteries, Chargers, LED lights and more