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Wow, I didn’t realise the 4s had that much battery life. I have the 3s and the sound quality is excellent - I don’t travel with them so much as they’re bulky and the noise cancellation isn’t as good as using my Shure in-ears with noise cancellation (which is pretty tough for any over-ear headphone to match), but at home or in the office they’re like floating away in a little bubble of distraction-less bliss.
I’ve been using them for at least a couple of hours a day this week and did a six hour flight on Sunday too. Still have 55% battery left. Battery life is mad.