I have an "X" on my battery Icon and when I click on it, it says No battery available

When I disconect my charger from my macbook pro it automatically switches off

It is version 10.7.5

Battery Information:

 

  Charge Information:

  Charge Remaining (mAh):          0

  Fully Charged:          No

  Charging:          No

  Full Charge Capacity (mAh):          0

  Health Information:

  Cycle Count:          0

  Battery Installed:          No

  Amperage (mA):          0

  Voltage (mV):          0

 

System Power Settings:

 

  AC Power:

  System Sleep Timer (Minutes):          180

  Disk Sleep Timer (Minutes):          10

  Display Sleep Timer (Minutes):          60

  Wake on AC Change:          No

  Wake on Clamshell Open:          Yes

  Wake on LAN:          Yes

  Display Sleep Uses Dim:          Yes

  PrioritizeNetworkReachabilityOverSleep:          0

  RestartAfterKernelPanic:          157680000

  Battery Power:

  System Sleep Timer (Minutes):          180

  Disk Sleep Timer (Minutes):          10

  Display Sleep Timer (Minutes):          60

  Wake on AC Change:          No

  Wake on Clamshell Open:          Yes

  Current Power Source:          Yes

  Display Sleep Uses Dim:          Yes

  Reduce Brightness:          Yes

  RestartAfterKernelPanic:          157680000

 

Hardware Configuration:

 

  UPS Installed:          No

 

AC Charger Information:

 

  Connected:          No

  Charging:          No

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