As a heads up, the battery pack is on sale for $51.I just received the Anker MagGo Ultra-Slim Magnetic Power Bank (10,000 mAh). It is very, very close in thickness to the Apple MagSafe Battery Pack. I like that it has a power button and it shows how much charge the Qui2 charger currently has.
As an Amazon Associate, MacRumors earns a commission from qualifying purchases made through links in this post.