Plan V: a contingency plan in the event of a full battery discharge smartphone

I think everyone remembers dozen situations in your life when you had to make an emergency call, the phone battery and villages. To solve the problem someone has a spare battery, someone - Power bank, and someone goes to a cafe to drink a cup of coffee and charge the phone.

Plan V offers another one possibility - buy batteries "crown" in the near stall and rapidly charge your phone on the go. Plan V is an emergency exercises as a keychain. If something happens, key is removed from the ring, connects to it and battery phone receives the necessary dose of energy.