PB battery drains even when plugged in

[moliere]

I've been monitoring the charge on my powerbook, and I noticed that it loses 0.1% of its charge every 8 hours or so. I recalibrated by draining the battery and charging it back up again, and it does charge to 100%, but after a day, the charge is down to about 99.7%. Right now, it's 99.2% although it's been plugged in for the last two days.

I've been monitoring this for the last two weeks, and I find it extremely odd. I reset the PMU, and there is no change in the behavior. Does anyone have any ideas as to what is going on?

Thanks.

[rainman::|:|]

I believe deviation between 98-99.9% is acceptable, it still indicates a "full charge". but i can't explain the behavior. how long have you had the PB, and approx. how many times has it been discharged/recharged?

[moliere]

My powerbook is 6 weeks old. The battery cycle count is 15 (I used it off the charger quite a bit in the first 3 weeks). The funny thing about it is that it does charge to 100% after I connect the charger, then slowly, the percentage decreases over time very consistently.

It's more a matter of curiousity for me right now. The last time I used it off the charger (Wednesday last week), I still got over 3 hours with it, with Airport and BlueTooth on, so the battery seems to be fine. I just don't want anything wonky going on with my brand new powerbook. For the money I spent on it, it better be close to perfect. :cool:

[Benjamin]

yeah it discharges so it doesn't explode in your face since over charging is bad. Most likely it will toggle from anywhere between 95% - 100%.

[moliere]

Okay, that does make sense. I still have a ways to go with respect to Apple Care, so I guess I don't have to worry about this too much just yet. Thanks for the insight, though.