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My 505 is 2 1/2 years old, and I find if I don't charge it all the way, it will show 4 bars when I unplug it from the outlet, but will then drop bars rapidly within a couple of days (instead of the usual couple of weeks).
If I charge it until the battery indicator light goes off, then it behaves normally.
I think the problem is with the battery monitor rather than the battery itself.
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