![]() Operating systems can be installed, uninstalled, and updated long after you’ve bought the computer. To understand the importance of a CMOS battery, you first need to understand what your computer BIOS is.Įvery computer has BIOS pre-programmed into its hardware. While the main laptop battery powers all of the components from the CPU to the hard drive and tends to be one of the largest and heaviest parts of your laptop, a CMOS battery powers just the BIOS, and is usually coin-sized and lives on the motherboard. Wait, my laptop has more than one battery? In short, yes. How do I replace the dead CMOS battery with a new one?.How do I diagnose a CMOS battery failure?.Thankfully, it’s easy to install a new CMOS battery in your laptop.
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