Original Replacement Battery L0729-LF GSP872693 01 For JBL Flip 4 Flip4 Portable Bluetooth Speaker Batteries 3000mah - AliExpress
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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