Mac falls asleep when battery gets down to roughly, half charged

it falls asleep once it gets to this point, and then i wake it up and the charge has gone right down.
Does it need to be calibrated? or is the problem bigger than that?

Most likely you need a replacement. There are known issues with MBP batteries, and an extension of the battery warranty to 2 years, as described on this page:
http://www.apple.com/support/macbook_macbookpro/batteryupdate/
Go to System Profiler (Apple menu > About this mac > More info) and click on Power. If the Full Charge Capacity is less than 4400 mAh for a 15" or less than 5000 mAh for a 17" MBP, your battery is failing. If your Cycle Count is less than 300, your battery is failing prematurely and Apple will replace it for free. If that's the case, call Apple or visit an Apple Store for a free replacement.

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