Do JBL Charge 3 and Flip 4 have battery issues? I've read a lot of reviews saying it keeps disconnecting or stops charging after a few months or a year. - Quora
Replacement JBL PartyBox 310 Speaker Battery (7.4 Volt, 10400 mAh, Li-Ion) | Battery Mart
JBL Boombox 3 warm weather and battery issues : r/JBL
JBL Flip 4 Troubleshooting - iFixit
Speaker Battery 3.7V,1100mAh GSP903052 for JBL Clip 4, AN0402-JK0009880