Vroom-Zoom more data!
I had my Vroom-Zoom out yesterday, and it flew fine at first, but then stopped taking much of a charge. On examination, it would appear that I have ruined the battery. There is no low-voltage cutoff, it seems, and you can drain the battery way too far down. In addition, it would seem that the charger is running too much current into the plane and cooking the battery that way.
A friend says that the battery is a standard "145", so can be replaced, and I know now to use a more sophisticated charger, and check the cell voltage occasionally when flying. Live and learn!
The foam body is cosmetic only, as it happens. You can save a gram or two by removing it.