Well, I could probalby use it, but if you want to fix it I'd bet that all that's wrong is the same thing I blew up in my Turnigy Watt Meter when I did the exact same thing (72V nominal NiMH). :lol:
http://www.endless-sphere.com/forums/viewtopic.php?f=2&t=21267&start=0
More info on the WU here:
http://www.endless-sphere.com/forums/viewtopic.php?f=2&t=21265&start=0
The TWM is a clone of the WU; you can see the guts are almost identical, if you look the original TWM thread here; I think there are even schematics:
http://endless-sphere.com/forums/viewtopic.php?p=242804#p242804