Question about Compaq Presario 4640 (311300-003) PC Desktop

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Need to change battery in compaq presario 4640

I have to reset the clock every time i turn on computer. it reverts back to 1997. works fine after reset.

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Unfortunately, most manufacturers will not list the exact type and model of your CMOS (Motherboard) battery; therefore, you will need to open up your computer, locate the battery on your motherboard, and record the information about it such as voltage, chemistry, wiring, and packaging. If possible, remove the battery and take it to the location you plan on purchasing a new battery from.You may be able to find replacement batteries at a nearby electronic store like Radio Shack, or online via a Google search.

Posted on Mar 12, 2009

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Posted on Jan 02, 2017

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first check if the time zone (same way you look at the clock to change it buyt select time zone settings) to see if that is correct. If that is then the first thing is to purchase a new CMOS battery from a store liek walmart. These batteries are 1-4 $ depending where you get them and the quality. You can open the computer up and look for a silver battery about the size of a quarter. Remove it carefully while the pc is OFF. take it to a store and buy the new one then replace it.

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hi
you will need to open your computer and look inside. if you are not sure take to a repair centre, the battery is on the motherboard, thats why you need to take really if you are going to be doing it. But i would advised to get a IT guy to do it for you. once its taken out you need to replace it with a new one.

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Time troubles


Your BIOS battery might be down. Becoz your board clock needs power from the board battery. So changing the battery on board will fix your problem.

Thanks
Iqbal

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