anyone have the weigth off Zippy Flightmax 5 s 5000 15 C ...I just got some batteries from Hobbycity and one off them was marked as 15C but its just some few gr.. lighter than the 20 ca 6 gr ...in their website it should be about 50 gr lighter and wonderd that it maybe is marked wrong...they also sold out off the 15 C </p>