Dell UPS 10000R - Manual (Page 68)

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UPS Maintenance
3 Remove both battery retaining brackets from the UPS (Figure 34):
Locate the left (labeled L) retaining bracket. On the left side of the chassis, turn the thumbscrew
counter-clockwise to release the left retaining bracket.
Push the bracket toward the center post to disengage it from the chassis. Swing the bracket toward
you and pull the bracket to the left to remove it. Set the bracket aside.
Locate the right (labeled R) retaining bracket. On the right side of the chassis, turn the
thumbscrew counter-clockwise to release the right retaining bracket.
Push the bracket toward the center post to disengage it from the chassis. Swing the bracket toward
you and pull the bracket to the right to remove it. Set the bracket aside.
Figure 34. Removing the Battery Retaining Brackets