I hope you don't mind me butting in here. I don't much about Hasselblads, but I have been doing quite a fair bit of reading over at the Medium Format web site and read in the Hasselblad Overview that the Nicad battery made by Varta for the EL/ELM/ELX has been officially discontinued. From the medfmt web site:
"This comes from Skip Cohen President of Hasseblad USA, although Varta has
stopped making the Ni-cad battery used in the EL, ELM and ELX they still
have better than a two year supply on hand. At this current time
they are looking for a new vender to make the batteries. This was not
Hasselblads choice, it was Varta's."
So maybe you should also try to find some of these batteries?