After dual booting ubuntu on my macbook 10.2, I noticed the battery was never really where it should be. My charger says it's at 100% (because of the green light), but ubuntu keeps it at 90-91%. It might be going up slowly towards 100% but it's way to slow to tell. When I log back into os x, the problem is gone so I don't think my battery is the main issue (it's old but still lasts 4-5 hours in os x). So I was going to try to bring it up to 100% in ubuntu, and then let it die down to 0%, which I read I should try on a couple of other forums, but it's now at 91% and has been for a couple of hours. So I don't think I can try that method. There has to be a way to calibrate it right?
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