The 10.2.5 update has definitely screwed up the battery warnings, as many of us have reported. Another thing I've noticed recently: With 9 minutes to go, I get an alert sound, but no alert window. However, if I ignore the warning, the computer will continue to work on "0:01" for another half hour or so before going to sleep. And yes, this battery has been "calibrated". I hope it's fixed with 10.2.6, as has been reported. Jerry