Although we’ve seen the same detachable battery idea in Tylt’s Energi Sliding Power Case, Dog & Bone’s Backbone and other cases, Pie’s key differentiators are in battery capacity, case design, and physical size. The 3000mAh battery is both larger and more capacious than almost any iPhone-specific cell we’ve seen, nearly doubling the thickness of the iPhone 5/5s, albeit using a soft tapered shape akin to old iPhone…
