3500mah Battery Gsp872693 01 For Jbl Charge 4 Jbl Flip 4, Flip 4 Special Edition+ Teardown Tool - Digital Batteries - AliExpress
JBL Charge 4 Disassembly - How to teardown? - YouTube
So i was watching a teardown of a charge 5 and saw that there are screws that need to be unscrewed in order for the ,,skin'' of the speaker to come off,
JBL CHARGE 4 portable bluetooth speaker teardown - Qucox