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Elsewhere someone has reported that the Sonata batteries in the new B series have a run time of only 4~5 hrs. It has also been conjectured that the 3-yr warranty extends to the battery because it may not be removable. A non-removable battery in a MacBook Pro that lasts 10 hrs is one thing; one that lasts half that long is another. It would be nice to get this issue clarified. Could be a deal breaker for people on the go with no way to recharge in the middle of a busy day.