What's the point of having a flashy iPhone that you filled to the brim with apps, music and videos but have it laying there dead without any battery left? The folks over at UNU specialize in keeping your iPhone alive for as long as possible. Hence why they came out with the UNU Exera Battery Case that we reviewed earlier, but apparently, that wasn't enough. One battery just isn't going to cut it for them. We take a look at their new UNU Exera Duo Charging Dock that can charge two battery cells at one time. Talk about maximum battery life. Head on past the break for the full breakdown.