You need to go into the BIOS settings to check this, which usually means you need to press the ESC, DEL or F2 key while the computer is booting. Some commercial battery-testing devices have a specific setting for 3V lithium cells, which test them under a carefully calculated load, but thats not something most people have sitting around in their junk drawer. Theyre nominally rated for three volts, and even when theyre almost dead, they still manage to show you nearly the full three volts. Cmos Battery Check Utility Full Three Volts Unfortunately, the type of motherboard battery used by most computers the flat coin-shaped lithium cells dont lend themselves to casual testing. If the batterys running low, it might not be up to the job anymore. When theres no power to your computer, the battery keeps those settings from being lost. Theyre a type of read-only memory, or ROM, that has some data permanently burned in those are your default settings but can also remember user-changeable settings like the time or what order it should check your drives for an OS when you boot up. If your computer cant seem to keep the right time, for example, or if it randomly gives you weird configuration errors, it might be that your computers CMOS battery is wearing out. There are plenty of step-by-step guides online, but unless youre good at this sort of thing, it might be better to have a professional do it. Cmos Battery Check Utility By inasarli1982 Follow | PublicĬmos Battery Check Utility Full Three VoltsĬmos Battery Check Utility Professional Do It
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