I've done this to some degree, with some VB software and a PMD 1208LS
USB data acquisition module. 

In my case, I was really looking at the battery charger, but the setup
would be much the same. You could use the PMD's analog out to do a
voltage to current sink, to program the discharge current, and you could
also do non-static current drains, simulating loads that draw low
standby, then want large run-time current.

I did some investigation of "memory effect" in NIMH cells using this
rig, with the results here, including printouts from the PMD software:

http://www.dvanhorn.org/NIMH/Index.php



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