Laptop batteries

[rlk at alum.mit.edu (Robert L Krawitz)]

I bought a couple of laptop batteries on ebay.  They weren't
advertised as new (indeed, they were specifically advertised as
"non-refurbished").  They seem to have lost 8~9% of their capacity.
Anyone have any idea how good this is?  Do these likely have a
reasonable lifetime ahead of them?

acpitool -e
 Kernel version : 2.6.13-15-defau   -    ACPI version : 20050408 
 ------------------------------------------------------------
 Battery #1     : present
   Remaining capacity : 30820 mWh, 51.04%
   Design capacity    : 66000 mWh
   Last full capacity : 60380 mWh, 91.48% of design capacity
   Capacity loss      : 8.515%
   Present rate       : 0      
   Charging state     : charged
   Battery type       : rechargeable, LION
   Model number       : 0004M778
   Serial number      : 2298
 Battery #2     : present
   Remaining capacity : 48480 mWh, 80.92%, 02:34:34
   Design capacity    : 66000 mWh
   Last full capacity : 59910 mWh, 90.77% of design capacity
   Capacity loss      : 9.227%
   Present rate       : 18818 mW
   Charging state     : charging
   Battery type       : rechargeable, LION
   Model number       : 0004M778
   Serial number      : 318
 AC adapter     : on-line
 Fan             : <not available>
 Thermal zone 1 : ok, 85 C