If your focus is on light weight, then my intuition tells me that making a removable nose cone on a jet that wasn't originally designed for that would result in more weight than just arranging the receiver and ECU batteries in the space allotted. With some innovation and planning, they probably can be put in a place that makes them removable for charging, although with the A123s and LiFe receiver packs, I don't think most folks are overly concerned.
Regards,
Gus