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Honestly I think you must be thinking of a different product, no? The battery pack is what powers the noise cancellation as far as I can remember. I could be wrong, but I've been using these for years and have never seen a model without the pack...that said, I've heard their new noise canceling wireless earbuds supposedly do just as well, so maybe that's an option? (I don't own the new ones, I can't keep track of wireless earbuds lol)
I would recommend:
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