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It would work fine, given the ROF issue that you're already aware of. But also be aware that the lower voltage will cause the motor to draw more current to turn over the spring.
As an example (these are not actual numbers, this is just for example): if an 8.4v 2200mAh battery required 1mAh to turn over the spring, a 7.2v battery would require 2mAh. On the other end of the spectrum, a 9.6v battery would require 0.75mAh. I recall reading somewhere the draw rate is on a curve, not linear - the motors most efficient voltage is around 8.4v or 9.6v depending on the capacity of the battery pack. The higher voltage push allows the motor to operate without having to pull as much current. At the same time, too much voltage can exceed the motors electrical limitations. Someone more skilled with motors can probably shed more light on that particular issue.
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