Battery conversion?

Is it possible to convert the wreck 2 canister light from DR from the lead acid to the NiMH battery pak. I have the MR 11 head? I should know but I am not sure. I know it is not the H-1 type. I do not have the HID head yet. Unless some one has some ideas on that also. I wanted to know burn times also. I know info is out there on different links and sites but I am now Fifity and the mind was the first to almost go.
Thanks for any leads.

It can be changed over, just have to ensure you maintain the voltage.

If your's is a fixed focus that relies on a toggle switch, then it is a MR11. The MR16 was also a fixed focus, but used an actuator head instead of the toggle.