Bluetooth
When Bluetooth is On but not connected to any device is it reducing battery life ?
Should it only be on when connected ?
iPhone 7, iOS 12
My experience from several years ago when I first turned it on and left it on was that the impact was very small. I don't remember the exact number but I think is was something like 2 or 3% more that my battery charge % went down in a 24 hour period.