My mark 2 version had a small 12v battery (2aH) mounted on the rear carrier to try and overcome the problems outlined above. The battery does solve all the cutout problems and the same gps and cable are currently working ok on my CCM600.
The problem with the battery on the XR was regulating the charging current. I just took the output from the rectifier straight to the battery through a switch - switch it on to charge, off when charged.
This was the system I used on my last africa trip and it worked fine until I forgot to switch it off one day. By the time I remembered the battery had lost most of its electrolyte and I had acid stains down the rack. A more sophisticated circuit would probably have worked ok
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