I did some research on the ni-cad batterys as well.
The Hasselblad site has a link for new batterys but they recommend a AA battery conv performed by them.
Turn around is around two weeks and the fee is small.
The seller said he has two Nicads with the camera.
One is still factory sealed in the box.
He claimed he charged the other two weeks ago and it still showing a charge without loss.
Hasselblad service told me that a full charge was good fro approx 1000frames.
This doesn't seem bad for a Ni-cad of that era.
So yes, I did a little home work in this area as well and am not to worried about the power situation.