Thanks all, with this step i can replace my Jabra battery, because it was broken. I followed the step to open it, easily by putting the headset in the table compared using two hands. I also upload how to change the battery (3.7 V, 240 mAh). The things we should noticed is the dimension (original battery is about 16mm x 28.5mm x 6.3mm) of the battery. Because i bought from China marketplace, it slightly wider but it can placed well in mine. Now i can use bluetooth again..