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If your computer loses its time setting overnight,
CMOS battery may not be holding a charge. The CMOS battery is located inside
case on
motherboard. Changing
battery is usually a job for a computer technician. In fact, a layman might not even be able to find
battery.
If you want to locate
CMOS battery in your computer, be aware that a static discharge from your hands can damage components inside
case. After taking proper precautions, open
case and look on
motherboard for a battery. If you have a diagram of your motherboard, locate
battery on
diagram first.
Different motherboards use different types of batteries. The battery may be shaped like a barrel or a coin. Some motherboards use a component that resembles a chip which contains
CMOS and
battery (made by DALLAS or Benchmarq). Batteries come in different voltages, so make sure you get an exact replacement.
Sometimes
battery is mounted in a holder. Sometimes it is soldered to
motherboard. De-soldering and re-soldering a battery is usually a job for a computer technician. An inexperienced solderer can cause a lot of damage. If you want to try to do it yourself, first practice on an obsolete circuit board. You may change your mind.
If
CMOS battery has failed because it's too old, this might be an opportunity to upgrade your motherboard. When upgrading a motherboard,
most important considerations are to make sure
new motherboard is
correct form factor for your case, and that
new motherboard has
correct bus connector slots for your expansion boards.
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