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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