From what I understand, cold depletes battery life, or at least makes batteries die quicker. It was mentioned in the movie Angels & Demons with Tom Hanks when they found a battery-powered bomb... it was cold and the girl who needed to find it said that cold depletes battery life. That probably only means when it's cold while the battery is being used that it drains quicker, but just putting it in the freezer unused should keep it charged for a bit.
it will kill the battery that's why the say not to leave your phone in the car in the winter. it destroyed the battery life. it will also shorten its life permanently, your battery will charge completely but it will die faster