Mac dies on full charge.

My Mac recently began shutting down or dying randomly while it's battery is fully charged. The only way I found to keep it from randomly going blank is to keep it plugged in. I don't know if this is an internal problem or if my battery needs to be replaced. I bought my Mac about 2 years ago.
According to the coconutBattery app, my current battery capacity is 3879 mAh when it was originally 5500.
From my system profiler:
Battery Information:
Battery Installed: Yes
First low level warning: No
Full Charge Capacity (mAh): 3879
Remaining Capacity (mAh): 3821
Amperage (mA): 66
Voltage (mV): 12625
Cycle Count: 383

i bought mine at the same time that you did and i am getting ready to replace my second battery. i followed the recommendations and still have had issues...
i hope it works out for you.

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