Date and time reset issue

HI sir,

I am using desktop. Windows 7.

From 2 to 3 months i am facing big problem of date and time reset.

On every start up it shows press f1 press f2 error.

To solve that issue i have replaced cmos battary. Then got problem solved. But my pc's time was running behind the real time clock after reseting time with current time..

After one week. Problem started again f1 f2 error.

Then i again checked that newly installed cmos battary voltage, it was showing 0.03v i dont get it. Why voltage drained so fast. In just one week cmos battary drained compleatly.

Please sir can you help me out to solve this issue ..
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