My iBook 500Mhz, has an odd battery problem. It still gets quite a while out of the battery, but lately I'd noticed that the indicator was going down faster than normal, as well as recharging faster than normal. When I left it off AC power, and the indicator dropped down, I found that, though I got the 10% warning, the level dropped all the way to zero. The interesting thing is that it stayed at zero, still awake with the airport card active and the screen at minimal backlighting (but not off) for nearly 1/2 hour! Does anyone know what's going on? This is the second time this has happened.