[Q] I have the aero plugged into the wall, and yet the aero doesn't think so
(the little light isn't on). I thought I recalled someone saying something
about the battery, so I took it out and sort of wiped it off. This worked.
Transiently.

[A] This doesn't seem right, since the battery should be parallel with the
external power. I can take the battery out when the external power is plugged
in, and it continues to work.

[A] Contact Compaq. You can't do anything to fix this problem on your end. I
had this problem. I complained to Compaq. They sent me another unit.