What's the difference in Apple RAID card battery error messages?

I have a Mac Pro with 2 quad core Intel Harpertown CPUs at 3.2GHz, and an Apple RAID card.  RAID Utility shows that the battery failed but in my research, nobody explains the difference between "Battery failed (code 0x#0 = 17)" (which is what I have) and "Battery failed (code 0x#0 = 18)" or ""Battery failed (other than expired)" (the latter two are what everybody talks about) and what the code numbers mean.  Speaking to a local AASP, they recommend that I just wait for a couple of days to see if it's doing the automatic 72-hour reconditioning operation since my Mac Pro is attached to a pretty hefty UPS (2200VA with nothing else attached) and power failures where I live are rare plus the write cache has been disabled so the RAID card is basically doing write-throughs at the moment.  But curiosity about the various, different error codes and messages is getting the better of me.  Thanks in advance.
Also, what's worrying me (since RAID Utility is so vague) is this entry I found under "Hardware RAID" in System Profiler:
  Status:
  Charging:          No
  Conditioning:          No
  Connected:          Yes
  Discharging:          No
  Sufficient Charge:          No

As an update to this, once I replaced the RAID card battery (which was an absolute nightmare--the writer of the instructions at Apple obviously had never done it for real nor seen it done since they omit a lot of important things), the problem went away.  But I'm still intrigued about what the error codes mean.

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      Hardware Version:          1.00
      Firmware Version:          M-2.0.5.5
      Expansion ROM Version:          0018
      Shutdown Status:          Normal shutdown
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      In Transition:          No
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      Model Identifier:          MacPro3,1
      Processor Name:          Quad-Core Intel Xeon
      Processor Speed:          3.2 GHz
      Number Of Processors:          2
      Total Number Of Cores:          8
      L2 Cache (per processor):          12 MB
      Memory:          8 GB
      Bus Speed:          1.6 GHz
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