Any way to measure the life expectancy of a PRAM battery?

Is there any way to measure the life expectancy of the PRAM battery through software?   Or must one open the case to determine the left over charge?  I have an iMac 5,1 that thus far is doing well.  But I am well aware the age suggests the PRAM battery may go soon, and I will have a two week period soon where I won't be accessing it, having to leave it off.

I'd love to know if there is something out there to do this. Just spent a few minutes searching and was only able to find something years out of date for the old 1/2 AA G3 PRAM battery, that only works in OS 9.
The best I've seen is to disable automatic time updating, shut down and unplug for several hours, and see if the clock is still on time when you reconnect to power. This seems very imprecise, to say the least, and you will be draining more power from the battery while it's off wall power.
Of course, you can always take it out and measure it with a volt meter, but it would be insane to go through all that just to measure it and put the same one back.
I think the life expectancy of one of the CR2032s, the lithium button battery which I'm supposing your early Intel, circa 2006, uses is around five years.
If this is your model, replacement doesn't look all that painful. My late 2009 21.5 is a total nightmare with 35 steps. Keeps on going even after the logic board is out. Why Apple puts what should be a user replaceable item in such an inaccessible place -- and getting more inaccessible with each new model -- I have no idea. I guess you're just supposed to throw out the computer when the battery dies.

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