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have you tried calibrating your battery?
Before you do the calibration, try unplugging your computer, let it get down to about 85% and then plug it back in and see if it goes past 98%...
 
This is totally normal. You don't need to do calibrate or do anything of the sort. Trying to force it to 100% all the time will actually damage the battery.
 
i had the same issue with my 2 month old macbook 98% with 25 charge cycles, I called apple care and I had a new battery within 24 hours, sent the faulty one back same day. It works great now.
 
My Dec '06 MB battery conked out after a month because of the issue some batteries had back then of completely dying if their charge depleted when the MB was in sleep mode. Had a brand new battery within 2 days care of AppleCare. This battery has served me well since, however, according to iStatPro the charge it holds is still at 100%, but the battery's health is at 64%. What exactly does this mean and should I be worried?

As far as I can tell there isn't anything wrong with the battery. I am aware that Li-Ion cells degrade over a period of three or four years, but my MB can still crank out 4-5hrs of usage with Wi-Fi and Bluetooth enabled provided the screen isn't set to it's 'blinding' setting.
 
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