Why does the magic mouse battery level drop suddenly?

I typically get, oh, about 3 weeks off of a pair of AA alkaline 1.5V batteries on my magic mouse.
What I don't understand though is not really being able to track the battery level in the bluetooth menu on my iMac 21.5".
The battery level even now is at 100%. What happens is is that it stays at 100% for several weeks and then all of a sudden drops to 7% or so, and I get a low battery warning. Then after a couple of days the battery will drain out.
After it drops down to 7% I can usually track the battery drain in the menu. But I never see it at 90% or 80% or 50%, etc. It just drops down suddenly near the end of the battery life.
Do other people see more continuous changes of the battery level?
The same thing happens with my bluetooth Apple keyboard that came with the iMac. Right now it is showing a level of 100%. It typically lasts for months instead of weeks, but I will never see an in-between battery level value until I get a low-battery warning.
I'm thinking of rechargeable batteries for my magic mouse. But I see too many negatives posted here in the forums about that, so I am hesitant about investing in those batteries and a charger if it's not going to work well.
Thanks,
doug

Maybe it's a Mac model issue? I'm running the late 2009 model, purchased in February 2010, and running Lion.
But I've never seen the battery level display in-between values.
Here's what it is showing now and I replaced the batteries over a week ago.
Do your batteries also last a few weeks in the magic mouse?
Thanks,
doug

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d

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Why does the magic mouse battery level drop suddenly?

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