Protect drone from lightning
Imagine how much cable you'd need to conduct a lightning strike. How thick would that cable have to be to conduct the strike without taking significant damage? You'd have to sheathe your airship in an equivalent amount of copper. (The cross-sectional area of the copper cable would have to be roughly equivalent to the cross-sectional area of any path lightning could take through the skin of the ship.) Long story short, under all that weight, your new toy wouldn't so much float majestically as... plummet ballistically. 

You won't have anything to worry about unless you actually intend to fly the thing in a thunderstorm, in which case, you should be far more concerned about how to protect yourself than your airship. Even so, it would be impossible to get enough power on board to counteract the winds in such weather.