Macbook pro occasionally doesnt charge until powered off

My late 2011 macbook pro running the latest version of mountain lion, occasionally wont charge untill powered off. I checked the battery health and its normal. I have the battery health app installed and it has 97.1% of its capacity availabe.
Could this be the charger? or some other issue?

1. The Genius will tell you the cost of the repair before having to pay for the repair. Moreover, you pay for the repair after having your Mac repaired.
2. Correct, but as I read, it looks like the hard drive isn't damaged so you shouldn't have lost anything, because this problem is different. Apple won't modify the hard drive, but to make sure, ask to the Genius about it when you take your MacBook Pro

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      Serial Number:    W0046Q08UBX0A
      Manufacturer:    SMP
      Device name:    bq20z451
      Pack Lot Code:    0000
      PCB Lot Code:    0000
      Firmware Version:    0201
      Hardware Revision:    000a
      Cell Revision:    0157
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      Charge remaining (mAh):    3211
      Fully charged:    No
      Charging:    No
      Full charge capacity (mAh):    5845
      Health Information:
      Cycle count:    943
      Condition:    Normal
      Battery Installed:    Yes
      Amperage (mA):    -1354
      Voltage (mV):    11210
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      System Sleep Timer (Minutes):    10
      Disk Sleep Timer (Minutes):    10
      Display Sleep Timer (Minutes):    10
      Wake On AC Change:    No
      Wake On Clamshell Open:    Yes
      Wake On LAN:    Yes
      Display Sleep Uses Dim:    Yes
      GPUSwitch:    2
      Battery Power:
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      Disk Sleep Timer (Minutes):    10
      Display Sleep Timer (Minutes):    2
      Wake On AC Change:    No
      Wake On Clamshell Open:    Yes
      Current Power Source:    Yes
      Display Sleep Uses Dim:    Yes
      GPUSwitch:    2
      Reduce Brightness:    Yes
    Hardware Configuration:
      UPS Installed:    No
    AC Charger Information:
      Connected:    No
      Charging:    No

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    Genius Bar reservation:
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