I'm having an issue that I'm not sure if is the battery or the adapter, first i have a macbook pro 13" early 2011, running lion, anyways what happens is sometimes when i plug in the battery charger, it won't charge unless i for lack of a better word, wiggle it,then the led light on the adapter turns on,took it to the apple store and i was given a new adapter,but is still doing it,I'm not sure what else to do here,is it the battery?