15"Macbook Pro shuts off after 5 minutes when using full-charged battery.

15"Macbook Pro shuts off after 5 minutes when using full-charged battery.  If not touched, computer stays on.  But start typing, it shuts off.  Was told this was a fan problem.  Had fan replaced last spring.  But problem has begun again.  Is this a battery issue or somethig else?

Charge Information:
  Charge remaining (mAh):          3747
  Fully charged:          Yes
  Charging:          No
  Full charge capacity (mAh):          3899
  Health Information:
  Cycle count:          90
  Condition:          Good
  Battery Installed:          Yes
  Amperage (mA):          0
  Voltage (mV):          12382
It says it looks fine....

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    Number Of Processors: 1
    Total Number Of Cores: 2
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    Bus Speed: 667 MHz
    Boot ROM Version: MBP22.00A5.B07
    SMC Version: 1.12f5
    Serial Number:
    Sudden Motion Sensor:
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    Message was edited by: Moderator

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