Eveready LED economy flashlight 4Pk energizer holdings, is one of the world's largest manufacturers of primary batteries, portable flashlights and lanterns. energizer is a global leader in the dynamic business of providing power solutions with a full portfolio of products including energizer brand battery products such as energizer ecoadvanced; energizer Max; energizer ultimate lithium; energizer recharge batteries and charging systems; and portable flashlights and lanterns.