NEC Univerge sv8500 Manual page 2647

7.4.1 When Mounting Battery Externally
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Referring to the figure below, mount the battery onto the BATT BOX ASSEM.
Referring to the figure on the next page, connect the battery cable.
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CHAPTER 2
Battery Mounting
BATT BOX ASSEM
(+)
(-)
(-)
(+)
Battery
VOL.3-160
TERMINAL-RELATED DEVICES