Comment 5 for bug 379599

I just have seen this on Jaunty (as of today, with all updates installed).

I had one battery at about 99%, the other at 0%. Usually this works without problems - if you use 2 batteries, you have that state rather often.

But today I plugged in the power supply with the batteries being in that charge state. Then some hint appeared at the top right of the screen "battery is critically low" and it immediately began to shut down my machine, killing all running applications...

That of course is completely nuts, because:
a) one battery was full
b) it was running on AC power (just plugged in)