Playing audio to bluetooth speaker uses less phone battery than playing audio to wired headphones?!
[Just curious, really, not a major issue.]
Starting from fully charged:
* an hour of playing high quality Spotify audio to my car’s speakers via bluetooth drops the battery of my iPhone 8 from 100% to about 98%, OR
* an hour of playing built-in Podcast app audio to wired earpods via lightning connector drops it from 100% to about 93%.
In both cases the phone is in my pocket with the screen off.
This behaviour replicates for me on several occasions. Is there an explanation?
I’m curious mainly because I would have expected that, if there were to be a difference between the two, it would be in the other direction. Is it really more efficient, power-wise, to send out bluetooth signals than to power wired headphones?