Does CMOS Battery recharge?

[xenolith]

#1 mobo, EP-8RDA3+, unused for the past six months and has a dead CMOS battery (keeps getting checksum errrors.)

#2 mobo, two years old, went the last year without being plugged in, and the battery was dead when put in the EP-8RDA3+.

#3 mobo, very old (4 yrs old) that I use once a month, has always been plugged in, and has never given me problems. Battery solved the checksum error when put in the EP-8RDA3+.

Is this proof that the CMOS battery recharges as long as the system is plugged into an outlet?

 

[pspada]

Nope, the batteries do not recharge on any system I've seen. but they may discharge if not used for an extended period of time, and possibly even corrode, leading to failure.

 

[Peter]

No. It's a battery.

It's just that it doesn't get USED while the machine is On. "On" also includes the pseudo-Off state an ATX machine is in after you pushed the power button.

 

[xenolith]

Thanks guys. I guess either way, it looks like I'll have to note the bios settings and take the batteries out so the they won't drain from now on.

 

[Peter]

Just do what the Taiwanese do before shipping the boards: Move the "CMOS Clear" jumper to the "Clear" position. That'll disconnect the battery.

 

[xenolith]

hmm... good idea.