My situation has nothing to do with headphones. I drive truck 8-12 hours a day and the stereo has no bluetooth, just a jack. So, this makes the iPhone 7 an impractical device for my lifestyle. I've had every iPhone released thus far but this seems to be the end of the road.
to play devil's advocate, because why not..
if you're driving for 8-12hrs a day and all your doing is music and not checking your emails/browsing the web/etc, then technically you don't need to charge as you have up to 40hrs of music playback