Windows 7 - cmos battery replacement

Tried to replace my cmos battery with one i bought from Asda ( lithium cr2032 3v)

Maybe i am doing something wrong ;but restarting the pc gave a beeping sound, so i replaced the original battery and the pc started ok except the date and time seemed to have reverted back to the date it was made.

Could this be a battery compatibility (they are both lithium cr2032) ?

Must admit its the first time i've changed a cmos battery in all the pc's i've had

pc is a Hp md8070uk media centre which is about 4y old now.

any ideas what's happening?

Regards Roy

Welcome rsinbad to the forums.

Whenever the battery is removed from a motherboard, the bios resets itself to the default time,date and other options. You need to go into your bios and set the date and make sure that all the settings are what you want them to be. Some have an option, after you have set the date and time to setup for maximum performance or you can leave the other settings to their default.


rich

rich is on point in what he's saying. I just want to add the the cr3032 coin battery is pretty much the standard battery so you did get the right battery.

Also the beep you're hearing is probably because the BIOS has been erased (reset) when you removed the battery, therefore as rich said you'll need to reset them to the settings they were before you removed the old battery.

Unfortunately we can't tell you what those BIOS settings should be as each BIOS is different, even between the same manufacturer. You'll want to concult the owner's manual on resetting the BIOS if you don't know what they should be.

Good luck

Thanks for your reply Rich, not sure how to gret into the bios and probably will be the default settings.

My concern is the cmos battery issue making alarm noises when i put a new one in. I am currently stuck with the old one which is as i said 4 years old.

Regards Roy

the one question i had was "why are you replacing the CMOS battery?" Normally you do not have to unless you notice some the time going crazy on you.. were you having problems with it?

CR2032 is the correct CMOS battery (as everyone else has said already)

its interesting that you are getting a beep when you boot up from the battery.. you dont technically even need one to run the machine

As said earlier the beep code is saying the BIOS needs reset. If you relace the battery you erase the BIOS info that was set, therefore requiring a reset to what they were before replacing the battery.

And yes you would only replace the battery if you noticed strange things like the time faiiling back to years past, wrong info such as CPU, RAM. These are indicators of a failing CMOS (BIOS) battery.

To be honest i have not noticed any time shift ;but the pc is 4yrs old, the reason i want to change it is i will be spending some time in Australia and wanted to be sure it had some current for when i got back.

Can i assume then that the pc will still boot into windows even though it is beeping,then change the bios setting if needed.

Cant find any refference to this in the old pdf manual

thanks for your feedback

It really depends on how old your motherboard/Bios is..... Most current ones are very intelligent that it will compensate for the lack of settings by doing it automatically but in the past years... you manually have to set them yourself.

Like they said in the previous threads... it is a good idea to set the BIOS up.....

What is the make of your computer? Most companies make their systems have Default Function keys at boot up to access the BIOS

I've had CR03032 batteries last for years in a PC. I have a MB that I bought in 2002 and the battery is still good.

Honestly the only time they need to be replaced is if you see issues like I posted above. You also need to be aware that replacing them means resetting your BIOS settings, thus it's best to write your BIOS settings down before changing the battery so you know what they were before the battery change.

The other thing you could do if you didn't write them down or don't remember them is go into the BIOS and choose the "set to optimized" settings - it'll set back to the default optimized settings before the battery was changed.

If this isn't done, it'll be set to factory settings which may not be the optimized settings for your hardware, especially your CPU and RAM.... which is also why you're getting a beeping sound.

Good luck.

Hi acurasd

Its a 4 year old hp 8070uk media centre not been in the bios so i guess it mst be as default?

regards Roy