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From a_gondhaleka to Hank94170. You asked: When was the last time you changed the cmos battery? Answer: Never. I think it is still the original battery. However, I have tested it, the battery shows 2.87 volts.

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We can change battery when we are getting message of cosmos. battery cause we can not keep time and date constant according actual time and date then we can say our battery is not working.3 volts. battery can work many yers.

Posted on Jul 16, 2009

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The real-time clock is maintained by a chip on the motherboard. It derives it's power from the laptop battery but there should also be a small 3V battery inside the laptop to maintain the clock and the CMOS settings in the event of total power loss. This battery should last at least 5 years and possibly longer if the main battery is kept charged.
In order to see if it is a Windows issue, start up the laptop and go straight into the bios setup. The clock will be displayed here and if it is the the same time as when you switched it off then the problem is hardware related, possibly with the CMOS battery. If the time is correct here then let the laptop boot into Windows and check the time again. If the time has now changed then the problem is with Windows, in which case you may need to check for possible viruses.
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Hi, I have a dell studio 1535 and the bios clock runs very fast. In one hour the clock pass few days. I try updating the bios, set to default values and nothing changes. This is a CMOS...


I dont think it is a cmos issue because i replaced the cmos battery and it did not help my clock. I also had dell fix the motherboard and it worked for bout 7 months unfortunately after my warranty was up. Til this day my clock last no longer then a few hours until it reverts back to the time i changed it to.

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Hi, can anyone help me. The time on my Acer 5630 is not changing properly. It moves on very slowly when I reset it , which I have to do every time I turn on my laptop. Once I turn the pc off the time does...


i think the cmos battery needs a replacement cauz you say the time is syncronised when you shut down your machine.man resson for this is the cmos battery is off needs replacement.
but befor that check the time option by double clicking on the time on the taskbar and go to internet time option and choose to syn it with world time and also check that you have choosed the corect time region.

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Click on this then exit your BIOS. Your computer should restart.
Make sure your new memory battery you put in is up the right way, if it's upside down it could be causing a short - the usual way is positive up, that's the whole flat face with the writing on it - the insulated button side is negative (down).

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