When I use my 5 year old MBP on battery it suddenly shuts off when the battery life reaches 88%.  Anyone know why and how to fix it?

when I use my 5 year old MBP on battery it suddenly shuts off when the battery life reaches 88%.  Anyone know why and how to fix it?

Model Information:
  Manufacturer:          Sony
  Device Name:          ASMB012
  Pack Lot Code:          1
  PCB Lot Code:          0
  Firmware Version:          110
  Hardware Revision:          500
  Cell Revision:          303
  Charge Information:
  Charge Remaining (mAh):          4108
  Fully Charged:          Yes
  Charging:          No
  Full Charge Capacity (mAh):          4200
  Health Information:
  Cycle Count:          40
  Condition:          Service Battery
  Battery Installed:          Yes
  Amperage (mA):          0
  Voltage (mV):          12361

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