I was debating to buy the QC35 but was disappointed that the battery on these is not replaceable. Designed for obsolescence (why did they design it that way?).

I was debating to buy the QC35 but was disappointed that the battery on these is not replaceable. Designed for obsolescence (why did they design it that way?). So I decided to go for the older QC25 version since that has the same noise-cancelling and is using AAA batteries instead. I don't really need the Bluetooth wireless aspect of it (though the QC25 can be converted to Bluetooth with a mod). Just a tip.