Hey people, so I just came back to HK to visit my family and notice that some computer stores and some street stalls sell these things call MiPow 6600. Link: http://www.mipow.com/product_detail.php?pid=2&lang=en They only output about 5W which would mean extremely slow charging for an iPad. I am not too concerned with the charging but more as using it as an external power source? Is this possible? Anyone has experience with this thing? I couldn't find any reviews on this thing. I just mainly want to know if I plug this thing in, would it take place of the built-in battery of the iPad and allowing it to be used longer. Thanks!