When on battery power, with about 1/3 of the battery remaining, the machine shut down and won't run again unless I plug into power.
This sounds like the same problem I am having on my Mid 2012 MacBook Pro 15". When on battery power, with about 1/3 of the battery remaining, the machine shut down and won't run again unless I plug into power.
From System Information:
Charge Information:
Charge Remaining (mAh): 2150
Fully Charged: No
Charging: Yes
Full Charge Capacity (mAh): 6413
Health Information:
Cycle Count: 32
Condition: Normal
Battery Installed: Yes
Amperage (mA): 3282
Voltage (mV): 11728
Regardless what those specs indicate, I would think it is a battery issue. SMC reset didn't help.
-kp
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