Compaq Evo Notebook n200 Reference Manual page 12

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CAUTION: Be sure the battery is fully seated in the MEU recess so
the connectors on the rear of the computer are exposed. Failure to
fully expose the connectors prevents the computer from properly
docking in the MEU.
Reference Guide
If an optional external battery pack is attached to the
computer, rotate the battery 1 down into the recess of the
MEU, then push the computer 2 toward the expansion
connector until the computer is docked.
Connecting and Disconnecting
2–3