Prong: Review: the Prong PWR is an iPhone battery case with a twist

After spending a year growing accustomed to the iPhone 6 Plus, I decided to go for the smaller handset. I've been pretty happy with the 6s thus far, but the smaller size means a smaller battery, and I've found it's not enough to get me through a normal day. When I'm working, my dock is typically within arms-length, but on days when I'm out [...]