I've never seen a message like that, but I can only think that it is the 
CMOS battery that is referenced. Most CMOS batteries are easily 
replaceable on the motherboard. They are normally small circular flat 
batteries. Note the + and - orientation when you remove it. You will 
probably be able to replace it at any store that has a reasonable 
selection of batteries. If not, you will need to try a computer parts 
store. There are computer battery on-line stores if needed. A relatively 
few motherboards have the battery connected to the motherboard and are 
not replaceable without the requisite technical skills and tools.

As to changing the CMOS back (I would start with "default" settings), 
just go into the CMOS as the computer initially powers up and make the 
change. If you can not get into the CMOS, a lot of motherboards have a 
jumper setting to clear the CMOS and restore the "default" settings. You 
will need to research your motherboard.

I've noticed lately that the terms "BIOS" and "CMOS" are routinely being 
used interchangeably. To me, the BIOS is the machine's settings that are 
on a chip and are not changeable without replacing or "flashing" the 
BIOS whereas the CMOS contains additional machine directions that are 
changeable by the user. The  CMOS requires a small trickle of energy 
from an onboard battery to retain its settings.

I hope this helps.

Tom Mayer



Darcy Lidge wrote:
> I was using a refurbished Pentium III Desktop (no name). During the boot process, I kept getting a message "Warning: Battery low. 2.26V or V 2.26". I went into the BIOS setup and changed the CPU speed to manual. Now the computer will not boot. What happened? Could this be related to the CMOS chip and if not, what battery is the system referring to?
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