JBL FREE II true wireless bluetooth earphones teardown - Qucox
High quality 3200mAh Battery GSP872693 01 for JBL Flip 4, Flip 4 Special Edition+ teardown tool|Digital Batteries| - AliExpress
Jbl flip 2 szétszedés/disassembly - YouTube
So, I have this old JBL Flip 2, it didn't turn on, that was an easy fix, however, it stopped producing audio, I hooked up the speakers directly to my headphone jack