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Replacing the internal battery :
The internal battery is heavy. Use caution when handling the heavy batteries.
A Phillips head screwdriver is needed to perform this procedure
1 - Pull off the front panel by pressing the tabs on both
sides.
2 - Disconnect the battery pack by separating the
connectors (never pull on the wires).
3 - Remove the metal protection cover in front of the
battery (three screws or two screws for 3U models).
4 - Pull the plastic tab to remove the battery pack and
replace it.