Super easy way to open any jbl charge port. Use a $4 lego pry tool and use the skinny end as well as pushing a light amount of force into the tab
Amazon.com: T-Power Car Charger Compatible with JBL Xtreme, Xtreme 2, Xtreme Portable Wireless Bluetooth Speaker (Black, Blue, Red) ac dc adpater : Electronics
JBL Xtreme 2 Review - RTINGS.com
JBL Xtreme 2 portable Bluetooth speaker connects to up to 2 smartphones or tablets » Gadget Flow
JBL Xtreme 2 Review - World Of Turntables
Amazon.com: JBL Xtreme 2, Waterproof Portable Bluetooth Speaker, Black : Electronics