well soldering everyday at my job i went on and did it, charged fine and made it threw flight fine. i dunno how it came off, i know theirs prob some vibration, but i'm sure unless u know 100 percent how to get it out that most copters out their have some vibration. but i don't see it shaking or vibrating while flying. now i do see some while spooling up, but i just assume this is normal since it goes away after reaching full speed. if more wires start breaking on other things than this battery then i will start assuming somethings wrong. but i'm very glad u said something because that never crossed my mind and now as i said if it starts happening some more i will know where to start looking.