Coachella Valley Music and Arts Festival

A small crowd gathers around a shaded charging station on the first day of the second weekend of the Coachella Valley Music and Arts Festival at the Empire Polo Club in Indio, Calif., on Friday, April 18, 2014. (Jay L. Clendenin/Los Angeles Times/MCT)

A small crowd gathers around a shaded charging station on the first day of the second weekend of the Coachella Valley Music and Arts Festival at the Empire Polo Club in Indio, Calif., on Friday, April 18, 2014. (Jay L. Clendenin/Los Angeles Times/MCT)