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3.
Remove the system box and cover.
4.
Remove the four screws that secure the DC-DC board on the chassis.
5.
Gently lift up the left side of the DC-DC board and slide out it.
6.
Replace a DC-DC board with charger function.
7.
Attach the bottom of the battery holder to the main board with 2 screws, then affix the rubber
battery cushion in the indicated location.
8.
Place the battery pack into the battery holder, with the power cable positioned as shown.