6000mAh 3.7v Battery bateria GSP1029102A for JBL Charge 3 (pls double check the place of 2 red wires on your old battery)|Digital Batteries| - AliExpress
Miady Replacement Battery for JBL Flip 4 and JBL Flip 4 Special Edition, Fits JBL GSP872693 01, 3000mAh 11.1Wh : Electronics
Replacement Battery for Jbl Flip 3 Gsp872693 Bluetooth Speaker Batteries - China Battery Pack, Batteries | Made-in-China.com