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[* icon_caution] Power off your device and unplug the power cord.
[* black] Position the computer upside-down on a flat surface.
[* red] Remove the external battery by sliding the latches towards each other.
[* black] Tilt the battery upwards and remove it from its socket.
+[* icon_note] Image Source: [guide|73346|HP ProBook 4540s Battery Replacement|new_window=true]