Battery
Description Spare part number
Battery, 4-cell, 48 WHr, 4.21 Ah 851610-855
Before removing the battery, follow these steps:
1. Shut down the computer. If you are unsure whether the computer is o or in Hibernation, turn the
computer on, and then shut it down through the operating system.
2. Place the computer in “Battery Safe mode” (Battery Safe mode on page 30).
3. Disconnect all external devices connected to the computer.
4. Disconnect the power from the computer by rst unplugging the power cord from the AC outlet, and
then unplugging the AC adapter from the computer.
5. Remove the following components:
a. Service door (see Service door on page 31).
b. Optical drive (Optical drive on page 32)
c. Hard drive (Hard drive on page 34)
d. Keyboard (see Keyboard on page 41)
e. Top cover (see Top cover on page 48)
Remove the battery:
CAUTION: Removing a battery that is the sole power source for the computer can cause loss of information.
To prevent loss of information, save your work and shut down the computer through Windows before
removing the battery.
1. Position the computer upright on a at surface.
2. Remove the 2 Torx T8 2.5×7.0 screws (1) that secure the battery to the computer.
62 Chapter 6 Removal and replacement procedures for Authorized Service Provider parts
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