How Long Does A Bios Battery Last. As you can see the number of years is quite lower than the average lifespan provided by actual users and mechanics. In a computer main board it might only be 25 years.
A regular CMOS battery would normally last 10 years and stop working or stop working well. It depends on the CMOS battery brand. 225 x 10 -3 4 x 10 -6 hr 56250 hrs.
Generally people switch out motherboards earlier as the battery dies - assuming the PC is active.
Some BIOS will only lose time and others will lose more. Set your multimeter to test DC voltage and a good CMOS battery will read over 300 Volts. Some may last 20 years. It depends on the CMOS battery brand.
