Dell E-Port - Manual (Page 11)

Using the Dell™ E-Port
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3 If your laptop has a battery that extends beyond the back of the laptop,
keep the battery bar retracted. Slide the battery bar adjuster to the left to
retract the battery bar.
4 If your laptop does not have a battery extending from the back of the
laptop, extend the battery bar by sliding the battery bar adjuster to the
right.