Panasonic Evolta AAA Alkaline Battery technology is the combined result of evolutions in sturcture, materials & production process. It delivers imporoved overall performance becuase of its structure that increases both inner volume and strength. As increase in active material and the use of positive/negative materials with higher reactive properties. In result, demonstrated in strength in comparison to other Panasonic bateries in a variety of low-tohigh drain devices. Includes 4 Batteries.