Why is my magic mouse reporting different battery levels?

I have 2 magic mice. One reports %100, the other reports %66 with the same batteries. Is one defective? Both are out of warranty.
ty

common
Ive got 2 mac mini
the magic mouse is a tad of a battery hog.
My magic mouse (both of them) use batts. about 3X as fast or more than keyboard, for obvious reasons.
Mouse is perpetually sending signal when moving and gets a lot more transmission output than typing by a long shot.
Magic mouse is transmitting about 20X as much as a keyboard is, why would you wonder why its using more batteries? 

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    common
    Ive got 2 mac mini
    the magic mouse is a tad of a battery hog.
    My magic mouse (both of them) use batts. about 3X as fast or more than keyboard, for obvious reasons.
    Mouse is perpetually sending signal when moving and gets a lot more transmission output than typing by a long shot.
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    Maybe it's a Mac model issue? I'm running the late 2009 model, purchased in February 2010, and running Lion.
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    iVain wrote:
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