Apple Smart Battery Case
The Apple Smart Battery Case is the case that charges your phone while it's at approximately 1%. First, you'll need to charge the case for it to work. It has 21 hours of talk time or 22 hours of web time.
Goat cases
A goat case is the newest case in 2016. It can stick to any flat and hard surface. It is also very thin, and costs about $40. It will fit any Android or Iphone.