I have other bluetooth devices that report battery life back to the phone. It shows up as a little battery next to the bluetooth icon on my iphone so I can quickly see the life in it. I think this would be a easy add on and a great win. I have attached 2 images showing what I am referring too. I believe the the vertical battery is easier to see, but either would be great to see.
Thanks.
iphone.png
Jawbone_battery-iPhone5.jpg