The NEW Duracell Activair Hearing Aid Batteries Size 13 come in a 2-pack, containing SIX batteries each. These disposable batteries have a battery capacity of 100 mAh and a voltage of 1.5 V. Made with zinc-air chemical composition, these size 13 batteries are designed for long-lasting power in hearing aids. The Duracell brand ensures reliability and quality in medical and mobility devices, making these batteries a convenient and essential daily living aid for individuals in need of hearing assistance.