Have the Power Pack gifted by my son and can now also soothes times longer be on duty away from a power outlet. Up to 2 times my Lumia820 can load when it is connected at approximately 20% battery status and the official used BlackBerry creates the PowerPack also 1 1/2 times. It is a pity that the Power Pack is not visible when the battery no longer provides sufficient power for a charge cycle; red light would be helpful. But that is no reason to deduct a star, because the PowerPack does that what is required of him; to be there when you need him.
Update: now my colleagues have also come on the taste and borrow the power pack for your iPhone 5 from. Simply original USB charging cable of iPhone5 plug in and be back online.
The Power Pack fits the way properly in the cradle / docking station silver find at Amazon Charging Station / Docking Station Silver for Nokia Lumia 1020/920/820/720/620/520