Review: Quarter is an External Battery for the iPhone That Charges With a MagSafe Cable

[mdelvecchio]

I've bought a few unauthorized accessories in China and they all work well and are a fraction of the price and better.

until they dont. plenty of stories of how unauthorized cables generate an error.

Apple likes to make out like the Chinese Apple accessories are ridiculously inferior. Some may be, but I've never run across any issues. Apple accessory prices are ridiculous.

[/QUOTE]

not really. heres a terrific article from an actual electrical engineer dissecting a cheap charger knock-off, and showing why it's much less reliable and safe than apple's design:

http://www.righto.com/2012/05/apple-iphone-charger-teardown-quality.html

...quality costs money.