Bluetooth + ipad Battery ?

i planning on buying ipad 3 when comes out, i'm thinking coupling pair of bluetooth headphones. main use movies,

has tried before , know how affect battery?



in advance,

 

bluetooth far biggest drainer of ipads'( i've owned ipad 1 , 2) batteries. shaves 2 hours off battery, , that's leaving paired speaker without playing anything.

 

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