I have an older Titanium PowerBook and a new Aluminum PowerBook. I had two power adapters with the TiBook and got a new one with the AlBook. The TiBook power units are 45 watts and I think the AlBook units are 65 watts. I've been using all three interchangeably on both PowerBooks. I'm writing to see if anyone has authoritative knowledge as to whether this is a good idea or not? The TiBook power adapters do seem to charge up the AlBook OK, though since the battery time on the AlBook is a lot worse than the TiBook, which doesn't seem as though it should be the fault of the power adapter if the indicator says 100%. I did calibrate all batteries according to instructions. -- Dennis Fazio dfz at mac.com