Widely acclaimed as the very best company in the industry of battery technology, Energizer has been leading the revolution in the world of batteries. The company that created the world's first ever mercury free battery has been at the forefront of a lot of the technological innovations when it comes to the batteries we use in our everyday lives for a variety of applications. The Energizer MAX family of batteries is now a household name because of the energy efficiency and reliability that the batteries in this lineup of products have to offer. It is only made better by the fact that the MAX family batteries by Energizer also happen to have a very long shelf life and the longest battery life in all commercial batteries. Among the MAX family, the Energizer 9V battery is one of the best heavy duty batteries you can get your hands on. With PowerSeal Technology developed by Energizer being incorporated into the Energizer 9V, you can be assured of a very long battery life and excellent retention capacity.