MBP June 09: Battery Level Drops from 100% to 99% while plugged in !

Hi,
I have noticed that the battery level (indicated in the menu bar) drops from 100% (after recharge) slowly to 99%, then 98% while the machine stays plugged in! I did not let it go further so I don't know if it would further discharge.
I re-calibrated the battery and this is still the case.
Does anybody know if this is normal ? I read on the web that this is due to Apple's battery charging algorithm ...
Thanks for your responses!
Cheers
Rainer

Rainer: Your MBP's charging system is designed so that once the battery has been fully charged, charging stops until the battery level falls below 93%. Then charging resumes. All batteries gradually lose charge as time goes by, without any power being drawn from them by usage. A typical notebook battery loses 0.5% to 1% of its charge per day, even when the machine is completely shut down or when the battery isn't in it (as might be the case for a spare battery). A MBP in normal sleep will lose 1-2% of its battery charge per hour, as some power is used to preserve the contents of RAM in that state. In Safe Sleep, the MBP is essentially shut down and no battery power is used at all, so the loss of charge is limited to the base 0.5%-1% per day.
Under extremely heavy loads (high CPU/GPU usage with maximum screen brightness combined with bus-powered portable drive operation, for example), your MBP may need to draw some power from the battery even while AC power is being supplied. Prolonged use under such conditions could, in theory, completely drain the battery, in which case the CPU clock speed would be automatically reduced to limit power demand to what the AC adapter alone can supply. But the likelihood that you'll ever need to work your machine hard enough for long enough to reach that point is very small.

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