I think there are actually two sides to this bug.

On the one hand, I occasionally get the warning that my battery's old or
broken and only has 36-25% maximum capacity left. (Not, this is not the
charge of the battery, but the maximum charge.) I don't know how it
estimates it (presumably from some battery self-description), but (a)
it's vastly inaccurate, as my charge couldn't have decreased that much
without me noticing, and (b) it decreased by about seven percent in the
two weeks since I upgraded. I didn't notice the warning in a while, but
I might have pressed the "don't warn me anymore" button, I'm not sure.

On the other hand, it's the estimation of _current_ charge that's the
problem. After I upgraded to Gutsy, the new estimator became active. The
problem is that it was convinced that power was critically low when the
battery was at around 50% charge (and it's weird, it _told_ me I had 50%
charge, but only five minutes left...) And since the computer was set to
shut down on critically low power, it _could_not_ learn that the charge
was enough for 40 more minutes, because it was shut down. I had to
manually disable the automatic shutdown (and risk data corruption) to
get it to learn it was safe to stay up until about 5% of the charge.

-- 
power manager insists batter is broken
https://bugs.launchpad.net/bugs/119318
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