How long they will keep well ...?

The USB stick is light beautifully bright, really bright! Therefore before 3 stars. But after about 30 minutes the whole stick is quite warm, even hot actually. The heat obviously has no way to escape from the transparent casing. That's why I'm going to make me soon on the back of some small holes for ventilation with the drill. I hope that the stick will then hold something. In the current state, I can not imagine that. Until then, he remains inoperative.