There it is!
Needed to know WHAT Netbook we're talking about here.....
Problem is the info only brings it down to,.....oh,.........about 7 different Acer Aspire One models, (At 8.9 inches)
That may be a low estimate.
Akin to, "I have a Ford Ranger, and need spark plugs for it."
Question that would come back is, "What engine size is in it?"
So my question is, "What is the Model Number of the Acer Aspire One? It's on the Bottom of the Netbook."
Otherwise you get generic information...........
As asked for;
CMOS Battery is also known as the RTC Battery.
Real Time Clock Battery.
For the above motherboard photo, it is to the upper Left, and near the white long plastic part, above it.
Right below it is a small round Black piezo style of buzzer.
Watch style type of battery, and is either a CR2032, or a smaller style.
Believe it to be on the Top of the motherboard, if memory serves.
Usual round watch style battery.
In photo, top of motherboard slightly off center to the Right.
Next to what looks like a small black round Piezo style buzzer.
Indication CMOS battery needs to be replaced?
Message, or Time/Date changes?
Replace the CMOS (RTC) Battery.
Trying to circumvent a password, by removing CMOS battery for a short period of time?
Don't think so. Believe there is a Capacitor, or Capacitors; that hold a trickle charge INDEFINITELY.
Suggest use an ESD wrist strap when working inside the netbook.
Otherwise you will Static shock out the delicate hardware components inside the Netbook.
Just videos that may help your endeavor,
For additional questions please post in a Comment.