I started to use the iPhone 6s Smart Battery Case as I thought at the moment.
It always goes back to the Air jacket barely after all even if you continue using various battery batteries and mophie battery cases.
Like the impression of the world I tried to try the iPhone 6s Smart Battery Case which was not shy with its smart design as well, and it may settle to this as I tried to try it. And so far it is a pretty good impression.
Design that is more familiar to the hand than it looks.
And the battery itself is consumed from the battery of the case without a switch at all, and at the time of charging it is charged from the main body in reverse, there is no unnecessary care.
It can be inserted in the lightning dock as it is, charging and synchronization can be done as it is.

The most compelling smart thing is affinity with iPhone (iOS).
Whereas other battery cases give priority to charging to the main unit, iPhone (iOS) uses it preferentially from the battery of the case and preserves it so as not to consume the body's built-in battery. Since it does not charge the sky iPhone from the case at once, always on the iPhone side there is an image that the battery is 100%. Thanks to this, I feel more comfortable with batteries than when I am wearing any battery case. I see, I agree with the meaning of smart.