For your computer, this isn't a problem - you (or a repair technician) replace the inexpensive battery. Batteries drain, and over time the CMOS battery will die. This way, even if the board is completely removed from power, the system will still remember your configuration options.ĬMOS Drain sounds terrifying, but it's honestly just the CMOS working as intended. ![]() They're used to provide an independent power source to store settings for the board, such as the date, time and basic configuration information. ![]() They're pretty commonplace every computer you've ever had uses one. ![]() ![]() The CMOS, or complementary metal-oxide-semiconductor, is the circuit type used to seat a battery to a motherboard. Let's start with explaining the essential components of the issue here.
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