ORIGINAL: Aussie_Toyman
The lower voltage reduces the motor speed, so you give it more throttle and the battery runs flat sooner. The internal resistance also creates heat in the battery, which is why you shouldn't discharge a LiPo at greater than its recomended maximum or you'll get to see for real what all the fuss is about (boom).
Okay now I'm getting alarmed. I'm putting some work into a plane with aa rx/tx and stock lipo, but with n20 motors/bigger props. I'm certain this is going to draw more current than the stock aa motor/prop combo, probably way more, it was enough to roast one of my mosfets on the original rx. Do I need a flack jacket or welding mask for this test? I will have to video record the first flight, if it explodes i want something to show for it!