"Service Battery" warning - what can be done?

I just noticed my mac has been saying to "service battery" and i have had mine for just over a year brand new, unfortuently just out of warrenty.

 

I leave my macbook pro plugged in all day most weekdays and when i come home have it off when i use it and put it on charge again when it needs to so i guess i do let it run down?

 

But im confused as it has only had 191 cycles.

 

  Charge Information:

  Charge Remaining (mAh):          1598

  Fully Charged:          No

  Charging:          No

  Full Charge Capacity (mAh):          4422

  Health Information:

  Cycle Count:          191

  Condition:          Service Battery

  Battery Installed:          Yes

  Amperage (mA):          -1480

  Voltage (mV):          11056

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