In such scenarios, your system will prompt you to input the Date and Time information before Windows is allowed to start up. Due to the power shortage, your computer might end up losing data stored on its CMOS after your device gets powered off. When you see the ‘System battery voltage is low’ message, then your PC has probably detected your CMOS battery is outputting an insufficient amount of voltage. CMOS batteries differ from the typical battery or cell you are used to seeing on the cover of computers. Now, you must understand that CMOS chips are responsible for maintaining the internal system date and time. These chips typically house specific hardware settings and information about your system memory or the hard drive in use on your PC and even security settings – especially those for your BIOS (Basic Input Output System). Almost all laptops are equipped with a CMOS (Complementary Metal Oxide Semiconductor) chip.
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