I have a dual battery cable for my V3 so that I can swap without stopping. I initially considered making another one for the R-44, but didn't bother since the internals AA's don't run down at all using a DVD battery, swaping external batts using the internals for backup is even less prone to an accidental intermitant power hickup and one DVD battery lasts pretty much all day anyway.
But if I did want one I wouldn't hesitate to by one from Ted!