In 2013, Bose sold wired noise-cancelling earbuds for $299, and you carried the battery in a plastic brick clipped to the cord. The new pair costs $99 and has no battery anywhere. What changed is the port. The headphone jack was analog. It passed a signal and almost no power, so anything running microphones and a noise-cancelling chip needed its own battery pack dangling on the wire. Once wireless buds showed up, the whole category died. Bose discontinued its last corded ANC model in…