My guess is that the Portable, the 100 and 150 all share the same kind of issues with unregulated power supplies. It almost makes sense for the 100, but it doesn't make a whole lot of sense in the case of the 150 though, since it was the last of the 1XX series.

I found what looks like an inaccuracy in tht Apple Page. They have battery Model. No. M4654 (the one that came in my 150) listed as 2.9Ah in the footnote, but as 2.5Ah in both places it appears in the table.

Still waiting for some more info to appear. Meanwhile, I need to check the UM to see if running the 100 without a battery is verboten . . . Luggable UM as well.