Rapthor 10000mAh Replacement Battery for JBL Xtreme Bluetooth Speaker – Rapthor Batteries
Amazon.com: Youejoeq 6800mAh High-Capacity Extended Replacement Battery for JBL Xtreme 3 Wireless Bluetooth Speaker, fits Part no GSP-2S2P-XT3A : Electronics
5000mAh GSP0931134 Battery Replacement for JBL Xtreme Portable Wireless Bluetooth Speaker - Newegg.com