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20 hours of listening is surprisingly low --

sony xm6 -- 30h

bose qc ultra -- 24h

would recommend the sony anc headphones, they're quite good.

XM6 does not support audio over USB-C (The USB-C port on the XM6 is only for charging) QC Ultra 2 does, but the headphones turn off when plugged in and have to be turned back on while charging

AirPods Max with USB-C and AirPods Max 2 appear to be the only headphones among this group (XM6, QCUltra2, AirPods Max with USB-C, AirPods Max 2) that support both Audio over USB-C and automatic charging while in use.

I have a B&W Px7 S2 supports, and it supports charging and audio via USB-C.

They couldn't use a bigger battery because they needed that extra space for their profit margins.

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