All laptops have a CMOS, or "Complementary Metal Oxide
Semiconductor," battery.
The main purpose for the CMOS battery is to keep the system
time, date and BIOS settings even if the computer is turned off or the main
battery dies.
Individual Acer Aspire laptop models differ somewhat, but
the general steps are the same when replacing a dead CMOS battery.Preparation
Read through the owner's manual for your particular Acer
Aspire laptop to determine what kind of CMOS battery you need.
Purchase the battery through Acer or a local or online
computer parts dealer.
Turn the laptop off and unplug it.
Also unplug any external hard drives, cameras or other
external devices.
Turn the laptop over (bottom facing up), then touch
something metal to remove static charge.
Removal
Remove the Phillips screws that secure the motherboard cover
(refer to your owner's manual if necessary), then release the cover from the
clips on the bottom of the plastic casing.
Lay the cover aside, then locate the CMOS battery cable on
the right side of the motherboard. Unplug the cable, then remove the battery.
Installation
Plug the new CMOS battery cable into the motherboard.
Slide the battery partially under the laptop casing to hold
it in place, then align the cover with the slots on the bottom of the laptop
housing.
Replace the screws, then turn the laptop back over.
Settings
Plug the laptop in and turn it on.
Enter your BIOS (usually by pressing "F1,"
"F2," F10" or the "Delete" key) before the operating
system loads.
Follow the BIOS prompts or refer to your Acer Aspire owner's
manual to reset your time, date and desired system settings.
BIOS Reset
Any time the CMOS battery is unplugged for more than a few
seconds, your BIOS will be reset to the default manufacturer settings.
If you make any changes to the BIOS that cause problems with
your Acer Aspire, unplug the CMOS battery for 3-5 seconds to correct the
problem.
http://support.acer.com/us/en/default.aspx
Acer aspire laptop battery replacement
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