Ummmm, interesting question, while I have never heard or seen a battery that has suffered from excess vibration I do suppose it is possible. Perhaps the worst thing I can imagine is the leads coming loose or a spot weld breaking. E-motors are for the most part very smooth in there operation the only other things I can think of that would cause vibration is a loose motor mount or an out of balance prop. These items would not only affect the battery but the rest of the airplane as well.
Scott
(leaving for the NATS around midnight tonight)