Amazon.com: Youejoeq 6800mAh High-Capacity Extended Replacement Battery for JBL Xtreme 3 Wireless Bluetooth Speaker, fits Part no GSP-2S2P-XT3A : Electronics
Speaker Battery 7.4V/5200mAh/6800mAh GSP-2S2P-XT3A for JBL Xtreme 3 - AliExpress
New Genuine battery GSP-2S2P-Xt3 For JBL Xtreme 3 speaker 5000mAh 7.2v 36Wh | eBay
Amazon.com: WRUMI Replacement Battery for JBL Xtreme 2, Xtreme 3, Battery SUN-INTE-103 5200mAh 7.4V with Tools : Electronics