Nick - Replacement batteries may be available, but I suspect expensive. The 9V conversion is so cheap and easy, I can't imagine not doing it instead. There are sellers on eBay who have 9V adapters. Just search "Hasselblad 9 volt" or some variation on that. I got one of those when I bought my ELX off eBay. I knew it was possible to make my own adapter, but I was in a hurry to get something running before the return period on the camera ran out.
Originally Posted by Nick Merritt
I did a quick search for DIY 9V adapters and found this page: http://www.nic.fi/~sos/hasseli/hassy-acessories.htm I suspect there are other pages on the subject, so you may want to search more than I did. If you are thinking of getting a motorized body, it may be worth making up a 9V adapter so you can test any body you find with bad or missing Ni-Cads.
And I agree with everyone else - a motorized Hasselblad is way cool, and often found at bargain prices.