Dell UPS 10000R - Manual (Page 10)

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Installation and Startup
NOTE: The battery retaining brackets are labeled L (Left) and R (Right) to indicate where they must be installed.
6 Remove both retaining brackets from the UPS:
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.
7 Ensure all battery connectors are disconnected.