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How to tell if my bios batterys gone?

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#1 aliboy66


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Posted 22 July 2013 - 05:30 AM

Hi I've got a Toshiba Satellite C650-15Z laptop. OS Windows 7. Let me start my laptop battery is losing charge very quickly, I know I need to change the battery but I've noticed my time and date is always wrong no matter how many times I set it to the right date and time. By doing a bit of research I think it's my CMOS BIOS battery, how would I know for sure that this is the problem. Also how would I go about changing it if this is the problem. Will this affect my computer in any way?


any help will be welcomed. 




I use google chrome. 


Thank you.

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#2 jhayz


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Posted 22 July 2013 - 07:25 AM



Changing the CMOS battery would not affect anything from your computer, just make sure you take the precautions or see the link above for more information.


#3 langr


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Posted 22 July 2013 - 10:35 AM

There are a number of "hot-to's" you can find by searching for your particular computer model and "replace cmos battery". Here's one:



It's not exactly easy to access the battery, but is doable. The symptoms you describe definitely point to a dead (or dying) battery. To check the battery, you have to remove it from the motherboard (so you may as well go ahead and replace it). Then use a voltage tester (volt-ohm meter) - a good battery should read about 3 volts. Anything much less than 2.5 volts indicates time to replace.

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