System sleeps when the computer shows 40% on a calibrated battery

When my 12" 867 MHz G4 powerbook is fully charged and has been calibrated several times, it sleeps when the computer said that I have 40% life left. Obviously, my machine has a problem knowing how much juice is left in the battery. I have already calibrated it, and when it sleeps, it doesn't even give me any warning. I have destroyed several CDs in the middle of a burn. Any help?

I started having the same problem recently. For a while (a year, maybe), I would get the low battery warning around 30%. In the last week, it has started to go out at about 45-50%, with no warning. I've tried recalibrating. I'm going to reset the Power Manager, then recalibrate. If that doesn't work, I'm going to replace the battery, which is three years old and has gone through 373 load cycles.
PowerBook G4 12 (revA) Mac OS X (10.4.2)

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and
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http://support.apple.com/kb/ts1363
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System sleeps when the computer shows 40% on a calibrated battery

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