Are you advocating to power servos with 7.2vdc? Most all hobby R/C servos are rated for 4.8 to 6.0 vdc voltage, and 7.2vdc is very likely to damage them. Also using the Vin output pin to power projects is subject to the polarity protection series diode on the arduino board, rated I think to 1 amp maximum current flow. As servos can draw an amp each depending on mechanical load and specifc model, you might want to rethink your power management proposal.Lefty
I wouldn't discount it entirely... 1st of all, the battery itself was intended for RC cars in the 1st place.