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Step 4: Remove the metal top cover of the battery box by unscrewing the 6 screws
present on the two sides (3 on the right side + 3 on the left side) and the 3
screws on the top and the 4 screws on the back side.
Step 5: Once the battery box is opened, remove the battery fixing plate present on
the left side of the unit by unscrewing the 2 screws.
Pull up first and then push the battery fixing plate.
Note: To install the second branch of batteries, repeat the same procedures on the
battery fixing plate on the right side of battery box.