Amazon.com: Pickle Power 5500mAh Replacement Battery for JBL Xtreme Bluetooth Speaker, Fits GSP0931134 with DIY Repair Tools and Instruction Guide (5500mAh, 11.84Wh, 7.4V) : Electronics
For JBL Xtreme 2 series 2.75-inch mid-woofer speaker, enthusiast dual magnetic | eBay