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
JBL Flip 2 MicroUSB Port Replacement - iFixit Repair Guide
Replacement Battery Part No.JN151PH13849, PR-652954 for JBL Flip 2, Flip II, 2200mAh/8.14Wh, Portable Speaker Battery : Electronics
Jbl Flip 2 Teardown Best Sale, 54% OFF | www.simbolics.cat