I have a Toshiba tecra A8 and I can't figure out this problem. The laptop only stays on when plugged into the a/c charger. However, Windows XP tells me that the battery is 100% charged, but if I unplug the a/c adapter, the laptop immediately turns off.
I tested the a/c adapter with a multimeter and it's working.
I tested the pins coming off the motherboard that go to the battery and they're getting power.
The battery charge light on the front of the laptop is telling me the battery is charging.
And Windows is telling me that the battery is charging (when plugged into a/c) and that it's at 100% charge.