Aa 12 Pack bundle of 10 packs High-energy aa batteries provide premium performance and are ideal for your medium-drain devices including calculators wireless computer mice battery-operated toys flashlights and led flashlights. They are suited to low-drain devices when changing batteries is difficult or inconvenient. High-quality materials ensure dependable long-lasting power for portable electronics. Mercury-free manufacturing helps minimize their environmental footprint. With ready power technology batteries stay fresh up to 10 years in storage. This technology helps control the internal stability of the battery with improved electrolyte utilization refined corrosion inhibitors and ultra-pure materials for long-term stability. The battery closure offers a tight seal for maximum reliability.