Energizer 9v. Energizer Max Alkaline batteries are long lasting batteries that go on for long periods of time when used in power hungry electronic devices. Since these Energizer alkaline batteries are more compact that most other Camping Essentials Batteries it is a good idea to carry them in a protective Camping Essentials Batteries if you're outdoors or in a small carrying bag. Energizer is also environmentally friendly in their Camping Essentials Batteries 9v Energizer Max Batteries as well as Energizer AA batteries Energizer AAA batteries Energizer "C" batteries Energizer "D" batteries and Energizer AAAA batteries use no mercury and that makes them environmentally conscious in that can be disposed of with regular household trash. Energizer 9 volt Max Batteries come in the following packs: 522BP Max Energizer 9 volt Battery 522BP-2 Max Energizer 9-Volts Batteries 2pk 522FP-4 Max Energizer 9V Batteries 4pk Specifications for Energizer Max 9v Batteries: Battery size: 9v alkaline Volts: 9 Features of 9 volts Energizer Max Batteries: Long lasting Designed for long-lasting performance in the broadest range of device application Seven year life span Package Contents: Energizer 9v Max Performance Batteries Energizer 9v