I’ve tested lots of iPhone battery cases since 2007, and quite a few great iPhone 6 battery cases over the past year. It’s extremely rare to find a battery case with integrated wall plugs that recharge both the battery and iPhone, but a company named Prong is now on its second-generation version of exactly that product. Prong’s first iPhone cases had no batteries, but included wall plugs so you could recharge wherever you found a standard wall outlet. Then it took the next logical step and added a spare battery for iPhone 5/5s users.

After a very lengthy pre-order process, Prong is about to release PWR Case for iPhone 6 ($100), a bigger and more powerful version of its earlier iPhone 5/5s case. PWR is atypical in several ways, starting with the aforementioned fold-out wall prongs, but also that it includes a detachable case, and is offered in a fully transparent version that may appeal to techies…

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