Amazon.com: Pickle Power Battery for JBL Flip 4, Flip 4 Special Edition Bluetooth Speaker, P/N GSP872693 01 : Electronics
JBL Flip 4 Reset Instructions - Tom's Tek Stop
Battery For Jbl Flip 4 Special Edition Player New Li-po Rechargeable Accumulator Pack Replacement Gsp872693 01 3.7v 3000mah - Digital Batteries - AliExpress