This power pack can charge your iPhone 6 in 15 minutes

We lamented the iPhone 6’s battery in our review, but the folks at ibattz have a solution for when Apple’s handset loses juice when you need it most. The company says its ASAP Charger’s 20-volt, 2-amp power pack can fully charge an iPhone 6 within 15 minutes.

Really? If this was safe why wouldn’t Apple do it out of the box? Are components for a 2 amp charger way more expensive than those for a one amp charger?