Replace PRAM battery in in Intel core2 duo iMac?

I have just installed the iStat widget in my Intel Core2 Duo 2.16 Ghz iMac. I was a little surprised to see a battery level reading on it (of 45%). I wonder if it is measuring the remaining life of the PRAM battery. Remembering how badly my Powermac and my wife's G5 iMac behaved when their back-up batteries needed replacing, I want to avoid the same situation on my Intel iMac. However I can find nothing on Apple support for replacing the PRAM/back-up battery on an Intel iMac, so I am wondering if there is a replaceable battery or not. Anyone know?
Thanks
Wilson

From iSlayer Battery Section:
This section shows various information about your Mac’s battery. This section is only visible if you actually have a battery and won’t appear on desktops.
Percentage
The current battery charge as a percentage. This is also shown as a bar at the bottom of the section.
Time
Time left using the battery, time until charged, or “Charged” if the battery is fully charged.
Source
“AC” if the Mac is connected to mains power, or “Battery” if the battery is being used.
Status
This shows if the battery is charged, charging or draining.
Battery Health
This is a comparison between your current battery capacity and capacity of it when it was new. For example, if your battery lasted 5 hours when it was new, a figure of 50% suggests you should get 2.5 hours out of your battery now.
Cycles
The amount of battery “cycles” the battery has had. One cycle is defined as a complete discharge and charge of the battery, but partial discharge and charges also count. So, two half discharge and charges are the same as one complete discharge.
For some tips on how to get the most out of your laptop’s battery, please visit this Apple support page.
Message was edited by: lakewoodlawnman

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