I have just bought my ipad mini and love it! However, a bit confused about the watts in the charger that came with it. For some reason I was under the impression that it came with a 12w charger but now I am reading it might just be 5w. If I could read the back of the charger, it would help!! But I cannot see any watts information on it at all. If it is indeed just 5watts, I presume I can use my 10w charger for the mini too?