A woman uses a portable battery pack to charge her phone while playing the augmented reality mobile game...
A woman uses a portable battery pack to charge her phone while playing the augmented reality mobile game "Pokemon Go" by Nintendo in New York City, U.S. July 11, 2016. Players must keep the game open and their phones' GPS running to play the game, causing battery life to be a concern for players. REUTERS/Mark Kauzlarich