MagSafe LED Green, but Battery Not Charging to 100%

I got my MBP 15" (the "low"-end version) about 3-4 weeks ago. About a week ago, I noticed that when working on my computer with the AC adapter plugged in, it charged up to 98% (according to both CoconutBattery and the Mac itself) and then stopped; the day after, it only charged up to 96%. That same day, I had the entire MBP replaced because of an issue with a faulty latch, and though I mentioned the battery % issue at the Geek Bar, I was told it isn't a big deal and should be taken care of by virtue of the replacement MBP. However, 2 days after, I notice that once again, my battery charges to only 98% and then stops; again, the MagSafe LED is still green as if it were fully charged.
Is this a problem/will it keep degrading? Or is it just normal? Is there any way to fix this?
Thanks,
~Ethan

Hi EthanRT: This is perfectly normal, battery behaviour. There is an explanation in this Apple article: http://support.apple.com/kb/TS1909?locale=en_CA
Enjoy
Stedman

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By battery will charge when off/asleep but will not charge while awake. It just slowly drains to nothing and dies even though adapter is plugged in. magsafe adapter light is green when open/on and orange when off/asleep and lights on battery indicate charging while in the latter state. still using stock battery that came with computer when I got it a few years ago, so it's not new by any means, but when fully charged lasts as long as it used to. I would think maybe charger is issue, but it DOES charge, just not while awake. not sure why computer wouldn't still work correctly while plugged in if in battery indicator it says power source is "power adapter," but its not. I have tried resetting PMU and calibrating battery. the combo of the two seemed to work when having issue a few months ago, but it just started doing it again. frustrating because once it dies I have to wait several hours until its fully charged again, so it cramps the workflow... any ideas? battery info from profiler below.
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Model Information:
Serial Number: DP-ASMB013-3556-2063
Manufacturer: DP
Device name: ASMB013
Pack Lot Code: 0001
PCB Lot Code: 0000
Firmware Version: 0102
Hardware Revision: 0300
Cell Revision: 0100
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Fully charged: No
Charging: No
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Disk Sleep Timer (Minutes): 10
Display Sleep Timer (Minutes): 20
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Wake On AC Change: No
Wake On Clamshell Open: Yes
Wake On LAN: Yes
Display Sleep Uses Dim: Yes
Battery Power:
System Sleep Timer (Minutes): 5
Disk Sleep Timer (Minutes): 10
Display Sleep Timer (Minutes): 1
Wake On AC Change: No
Wake On Clamshell Open: Yes
Display Sleep Uses Dim: Yes
Reduce Brightness: Yes
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