The Energizer Eveready Super Heavy Duty Zinc Carbon AA Batteries are a true testament to the fact that Energizer does not kid around when it comes to their innovations in battery technology. The AA Super Heavy Duty Battery is one of the main reasons why we know Energizer as the leader in battery technology industry. Now available in the 4 Pack, the Energizer Eveready Super Heavy Duty Zinc Carbon AA Batteries make for an excellent power source for all your household appliances that would just not seem to work for very long on your average battery. Thanks to the incredibly high quality build, you can expect performance that is much superior to any other battery in the market with the same size. The Eveready is always going to be your most reliable choice for a battery when it comes to emergency situations.