I have a Hasselblad H2 an a PhaseOne P20/H101. I had not used the camera for a while (about a month) and it would not turn on. I initially thought it must be the battery but my friend Brett in Tasmania, who knows my camera and who is a great repairer of cameras, gave me some suggestions to try.

The outcome is the H2 is working perfectly, the P20 ditto - BUT - if the P20 is switched on then the H2 will NOT switch on. Has anyone any experience of such a problem?

Brett suggested it may be a secondary battery in either of the components - can anyone enlighten me if the H2 has such a battery. If so, what size and how can I get it replaced?

Any help/suggestions will be very gratefully received!