Amazon.com: Tectra High Capacity Replacement Battery + Tools for JBL Charge 3 2016 Portable Speaker, Fits for JBL GSP1029102A (Li-Polymer 3.70V 6200mAh/22.94Wh) : Electronics
JBL Charge 3 Battery - iFixit
Battery for Speaker JBL Charge 3 III 2016, Li-Polymer 6000mAh
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
Replacement battery for JBL Charge 3 Speaker- 2016 Version - GeeWiz