What is the physically smallest AC power adapter you can get for the X21? I am using a standard 72W unit at the moment and it's getting quite crowded in the little bag I have for it (once I include PCMCIA cards and USB drives).
I bought a cheap IBM 12J1444 2.2A 16V supply but it's too weak to run the X21 *and* charge the battery. It can do either one of the two quite happily though. It was a bit of a gamble, buying that






