First, the headset does not use screws, just use the buckle to combine the front and back shells, and use the dismantling rod to pry from the charging port. Just pry a loop and you can open it
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Second, to change the battery, first determine the battery model, for this battery we only need to pay attention to a string of numbers on the battery
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Third, the number on this battery is 401119 is the model of this battery, in fact, this is the size of this battery, thickness 4.0, width 11, length 19, the unit is millimeter. We searched this string of numbers directly on Taobao to find the battery we wanted.
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Four, remove the old battery, and then weld the new battery, the process is very simple. Fifth, do not install the shell after installing the battery, first boot test, no problem and then install the shell is not too late. You can see here that the blue LED has lit up.