Battery Problem - Turning off with 60 % left

Hi
I am having an issue with my 2009 Unibody 13" macbook
I have had absolutely no issues at all since I bought it and the battery life up until now has been amazing.
However the last 2 days I have had something strange happening... when I charge the laptop fully (100% shown in bar - green light on AC adaptor)....
I then use the laptop on battery - it tells me I have the normal amount of time remaining on battery power - it gets down to anywhere near 60-65% left and suddenly turns off...
It is the dead - not even in dead sleep until I plug in my AC adaptor again...
My battery info is below:
Battery Information:
Model Information:
Serial Number:          9G85201ZQ3NYB
Manufacturer:          DP
Device name:          bq20z951
Pack Lot Code:          0000
PCB Lot Code:          0000
Firmware Version:          002a
Hardware Revision:          0005
Cell Revision:          0100
Charge Information:
Charge remaining (mAh):          2132
Fully charged:          No
Charging:          Yes
Full charge capacity (mAh):          3093
Health Information:
Cycle count:          210
Condition:          Normal
Battery Installed:          Yes
Amperage (mA):          757
Voltage (mV):          12171
As you can see this all appears very normal? Is there a fault with my battery?
It is only just over 2 years old - and I have had laptops before and always ensure I cycle the battery when using it - full charge, use of battery, full charge, etc...
I will not be able to calibrate the battery as it says on Apple support because the battery just turns off when it gets to 60-65%...
Any help would be appreciated...
Thanks
John

Thanks Andrew...
I have done an SMC reset and it is now running on battery currently run charge down to 50%
So it is at least better, but I will run it flat, then charge it...
Ironically I think the SMC thing might have something to do with why it took over 6 hours to charge last night!
I will reply back so people can learn from my experiences...
Cheers mate!

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