Okay, this is regarding my iPod Nano but the iPod forum has little traffic these days so I was hoping someone here could answer this. I recently started using JBL blue tooth ear buds for running (work great) with my Nano and because I know leaving the blue tooth turned on uses more power, I always turn it off after the ear bud use. I also always power off my iPod after each use to save power. As long as I power off this iPod each time do I also have to turn off the blue tooth function in order to save battery life? I wasn't sure if maybe the blue tooth would still be "running" in the back ground so to speak.