I just bought this mid-2013 11.6 inch macbook air from Futureshop. I turned it on, and the battery is at 10%. I checked online to see unboxing videos on youtube and everyone seems to be at over 90% when they first turn it on. Did the store owner just give me one that is open box? It was brand new, packaging and everything. I don't know if this is normal and am feeling a little uneasy. A little advice please? Thank you so much.