Paying attention to the lives of backup batteries, along with the use of a surge protector, will give your computer's memory the best protection. The most common type of computer battery is a backup battery known as the CMOS, or Complementary Metal-Oxide Semiconductor. The CMOS is the IBM-compatible backup battery that stores computer information such as the calendar day or time. If you ever see a prompt for the computer's day and time when you turn it on, it may be time to replace the CMOS. Although this battery is designed to last a decade, certain conditions and temperatures can easily shorten the life of a backup battery.

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