The Panasonic AAA Evolta Premium Batteries Pak (2 Pc.) offers EVOLTA’s progressive design (EVOLUTION) and high power (VOLTAGE) combines in a battery that consistently outperforms other premium products in accepted performance tests. In fact, it’s our No.1 longest-lasting alkaline battery. By evolving Material, Process, and Structure, EVOLTA protects you and your devices while delivering sustained power in high-drain applications, even after 10 years* in storage Batteries look the same on the outside, but hidden factors influence the quality of your experience. Panasonic’s accumulated battery knowhow, passed down by generations of artisans, is enriched by R&D to give EVOLTA a winning edge. Material Evolution, Process Evolution, and Structural Evolution combine in a new world standard for quality. High Energy Formula uses refined materials supplied to us exclusively. Cathode features high-purity MnO2with a titanium additive for smooth discharge and extended storage life, while a new surfactant revitalizes zinc reaction to efficiently sustain power in high-drain devices. Double High-Density Power Core not only helps to extend battery life, it also stabilizes discharge performance for a smooth energy flow to your device. Panasonic’s original Special Tough Coating is a nickel-iron alloy that reduces contact resistance, optimizing energy flow and keeping your appliances working at their best.