HP mt20 Maintenance and Service Guide - Page 60

Battery, Remove the 3 Torx T8 2.5×5.0 screws

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Battery Description Battery, 4-cell, 48 WHr, 4.21 Ah Spare part number 851610-855 Before removing the battery, follow these steps: 1. Shut down the computer. If you are unsure whether the computer is off 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 25). 3. Disconnect all external devices connected to the computer. 4. Disconnect the power from the computer by first 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 26). b. Keyboard (see Keyboard on page 32) c. Top cover (see Top cover on page 39) d. USB/audio board (see USB/audio board on page 49) To 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 before removing the battery. 1. Position the computer upright on a flat surface. 2. Remove the 3 Torx T8 2.5×5.0 screws (1) that secure the battery to the computer. 50 Chapter 6 Removal and replacement procedures for Authorized Service Provider parts

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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
off
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
25
).
3.
Disconnect all external devices connected to the computer.
4.
Disconnect the power from the computer by
first
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
26
).
b.
Keyboard (see
Keyboard
on page
32
)
c.
Top cover (see
Top cover
on page
39
)
d.
USB/audio board (see
USB/audio board
on page
49
)
To 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 before removing the battery.
1.
Position the computer upright on a
flat
surface.
2.
Remove the 3 Torx T8 2.5×5.0 screws
(1)
that secure the battery to the computer.
50
Chapter 6
Removal and replacement procedures for Authorized Service Provider parts