to further what paulvi said, most li ion cells do not provide the current needed for most flight applications. (again, most, yes there are people flying with micro stuff...) they may work a couple of times, but it is way outside their useable limit and will have a very short life cycle, if they do work. also, many liion cells have an internal safety circuit that limits current. it is very likely you would just trip that as soon as you spun up your motor.