Hi. I have dell Optiplex 755 Desktop PC but I'm facing a problem with it. It's CMOS battery gets die so quickly. Mostly the CMOS battery can last for a year. I have replaced 3 CMOS battery. But they got expired within month. Please help me that how I can overcome to this problem.
Many places sell these batteries cheap because they are already several years old.
Get one from a pharmacy aka DURACELL DL2032 which isnt going to be more expensive but will last longer.
They have a maximum 10 year shelf life. LESS in a HOT environment.
You are turning off power strip at night. The battery is only designed to run the clock for short periods of time not 8 or more hours a night every night.
This could also be a problem with the motherboard. Run the diagnostics to test all the hardware including the motherboard. This is a 7 year old model. It might be time to replace it.
I have several desktop computers that are unplugged for four to six months each year without the CMOS battery dying. One is 10 years old without a battery replacement. This is most likely a mother board issue.
I use cheap Chinese 2032 batteries for high demand applications and get usage equivalent to US drugstore versions. Cost is about a tenth as the drugstore.