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5. To remove the battery back board assembly:
Unscrew the two M3×6 crosshead screws to take out the lead-acid battery back board
(if installed).
Unscrew the four M3 nuts to take out the Li-ion battery back board (if installed).
NOTE
z When removing the Li-ion back board, do not unscrew the wrong nuts.
6. Unscrew the six FT3×8 screws to take out the batteries separator.
Notch