Dell Alienware Area 51 (Late 2009) - Manual (Page 88)

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CHAPTER 18: BATTERY
Battery
WARNING: Before working inside your computer, read the safety
information that shipped with your computer. For additional safety best
practices information, see the Regulatory Compliance Homepage at
www.dell.com/regulatory_compliance.
WARNING: A new battery can explode if it is incorrectly installed. Replace
the battery only with the same or equivalent type recommended by the
manufacturer. Discard used batteries according to the manufacturer’s
instructions.
WARNING: To guard against electrical shock, always unplug your
computer from the electrical outlet before opening the side panel(s).
WARNING: Do not operate your equipment with any cover(s) (including
side panels, bezels, filler brackets, front-panel inserts, etc.) removed.
CAUTION: Only a certified service technician should perform repairs on
your computer. Damage due to servicing that is not authorized by Dell™
is not covered by your warranty.
CAUTION: To avoid electrostatic discharge, ground yourself by using a
wrist grounding strap or by periodically touching an unpainted metal
surface (such as a connector on the back of the computer).