My macbook does not hold a charge

my macbook no longer holds a charge after having it plugged in all night.  Any ideas on what is causing this?

Late to the party, but if you could help this would be great.
System Power Settings:
  AC Power:
  System Sleep Timer (Minutes): 30
  Disk Sleep Timer (Minutes): 10
  Display Sleep Timer (Minutes): 20
  Automatic Restart on Power Loss: No
  Wake on AC Change: No
  Wake on Clamshell Open: Yes
  Wake on LAN: Yes
  Display Sleep Uses Dim: Yes
  PrioritizeNetworkReachabilityOverSleep: 0
  Battery Power:
  System Sleep Timer (Minutes): 15
  Disk Sleep Timer (Minutes): 10
  Display Sleep Timer (Minutes): 15
  Wake on AC Change: No
  Wake on Clamshell Open: Yes
  Current Power Source: Yes
  Display Sleep Uses Dim: Yes
  Reduce Brightness: Yes

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