PowerBook g4 667mhz battery over reporting mAh

I get about 30 minutes on battery.

Hi, Zach. Your 30 minutes of working time is a clear indication that your battery is on its last legs. Its end-of-life condition is not the result of the faulty reporting, but the cause of it.

It's quite typical for the stats reported about a battery to become increasingly unreliable and finally meaningless as the battery's condition deteriorates, which happens very rapidly when it's as far gone as yours is. You don't need to worry about overcharging. Replace the battery, and you should be fine.

I'm still inclined to think replacing the battery is the solution. It could be damaged as the result of overheating (as from being left in a closed car in the sun on a hot day, for example), it could have one cell that's going bad, I don't know what all might be wrong with it.

In your shoes, I would:
- Reset the Power Management Unit;
- Use the Powerbook on battery power alone until it puts itself to sleep for lack of power, then allow it to recharge fully, and see whether the stats reported for it become any more plausible.

If neither of these steps seems to make any difference, buy a new battery. If all seems to be right with the new one, keep the old one as a backup until its behavior becomes so erratic you don't dare use it. If similarly erroneous stats are reported for the new battery, take it and the Powerbook in for diagnosis by a technician.