defunked battery?

[Will Lomas]

                hi to prove m battery is dead look at the battery stats below
compare the full capacity to what is left does this sound defective?
i have only had the unit since 2 june 2008



  Model Information:
  Serial Number:        SMP-ASMB016-384e-6d9
  Manufacturer: SMP
  Device name:  ASMB016
  Pack Lot Code:        0000
  PCB Lot Code: 0000
  Firmware Version:     0110
  Hardware Revision:    0200
  Cell Revision:        0102
  Charge Information:
  Charge remaining (mAh):       1580
  Fully charged:        No
  Charging:     Yes
  Full charge capacity (mAh):   4768
  Health Information:
  Cycle count:  128
  Condition:    Good
  Battery Installed:    Yes
  Amperage (mA):        2090
  Voltage (mV): 11652