I had my 2010 13" MBP's battery replaced by Apple yesterday and now I'm showing I have like 3:45 remaining on a full charge. I looked around online and it says I should be getting up to 10 hours. I'd be fine if it said I have 8 hours remaining but <4?? Do these take a few days or something to calibrate? I know they're supposed to be precalibrated but when they're replaced is there something it needs to go through? I'll call up AppleCare in a few days and see what they say.