Definition: Given an Amazon customer review, write a title for the review. The preferred titles are under fifteen words.
Input: I don't know if it is a bad unit or a bad design, but if I have mine very far off of flat the fan makes banging noises, but when flat it is perfectly fine.  I normally just use it for recharging my Microsoft Surface tablet and it pumps plenty of power for that, haven't used it for a laptop yet, though the specs say it should be ok.

Bad fan or bad design?