Energizer has always been at the forefront when it comes to innovation in the world of battery technology. With the creation of the world's first ever mercury free battery, Energizer set itself apart from the rest of the companies in the industry and has been leading the industry ever since. Making the promise of delivering long lasting battery life is not a joke when it comes to Energizer. When they make such a claim, they actually made it a point to create such batteries. That is why they rolled out the Energizer MAX family of batteries. Among their excellent lineup of batteries comes the Energizer AA batteries which you can now buy in a pack of 4. Gone are the days where you have to constantly head out to the store to buy new batteries again and again every time you get your groceries. When you get a pack of these, your worries about the batteries running out will end.