Has anyone experimented, or is it even ok, to use different batteries? It'd be nice to know from a Freefly tech the tolerances of the motors in the M15 and the recommended battery values. Would a higher voltage increase the speed of panning and tilting for instance? I'm guessing a higher Ah would prolong the life without any other issues? Please don't tell me to ONLY use the batteries bought from the Freefly store either!