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[title] Mount the new battery
[* black] Plug in and let the soldering iron heat up.
+[* black] Use caution when using a soldering iron, the tip will be very hot.
[* black] Flip the main board and spot the solderings of the battery terminals.
[* black] Desolder the terminals of the previous battery. Use a desoldering pump if too tedious.
-[* black] Solder the new 3 Volts battery.
+[* black] Melt the solder and softly push the terminals of the new button battery into the holes of the circuit board.