Replace rechargeable cmos batteries with non-rechargeable?

Hallo,
the cmos coin cell of my Acer Travelmate 290 (5 years old) seems down (2.539V of 3V) so i detached it and removed the soldering tag to get exact description.

Its a rechargeable one and more expensive than standard CR1220 non-rechargeable types (7Eur vs 0.60Eur) and harder to get.

Do laptops recharge those cells indeed? Can i replace this cell with a standard CR1220 one?

 

well you can just charge up your old one and put it back in.
You can use a 3Volt power adaptor to do this. Just keep the amperage low, like 10mah for charging.
Bubble cells are generally around 200mah or less.

You can replace it with a standard CR2032 battery. Just make sure that the battery is sealed on the ends, so that it does not short against anything.

My old Compal Cl-56 had a rechargeable battery in it, but when I measured the voltage without the battery installed, I was getting nothing from the motherboard, so I assume yours is the same. So you should be able to replace it without any problems.

K-TRON

 

He means CR2032... just to clarify.

 

yup
sorry small typing mistake

thanks for catching it ramgen

K-TRON

 

I don't think i will recharge my old battery. It is kinda malformed since i removed the solder tag.

But how can you make sure the laptop doesn't try to recharge that non-rechargeable battery? I mean, doing this might harm the batterie (explode).

Why a 2032? Mine is a 1220 (12mm diameter, 2.0mm height). I don't think it will fit. CR1220 are common and easy to get as standard non-rechargeable button cell. Only rechargeables are hard to get.

 

You might as well buy the right thing if you are worried about it. You can buy the same rechargeable battery that you removed here:
http://www.pchub.com/uph/laptop/602-16970-1726/Battery_Coin_Rechargeable_Maxell_ML1220.html

You can try using a CR1220, but before buying a battery, power the system on and use a voltmeter to measure the voltage at the points where the bios battery would normally be.
If you are getting any voltage from their without any battery attached, the system does charge the battery, so using a non-rechargeable battery could be dangerous.

K-TRON

 

If your laptop tries to charge a CR1220, there is a very good chance that the cell will fail catastrophically. At best this will spew corrosive, toxic, debris around in inside of your laptop. At worst, the cell will explode and catch fire.

Is the risk worth the $3 price difference between an ML1220 and CR1220?

 

True. I will put the old battery back-in since people told me its ok unless CMOS values get missing.

I'm not sure if i can actually repair the laptop's other defects like constant freezes. If the GPU is broken its not worth 7Eur anymore for that battery.