Modern zinc-air high performance battery: This hearing aid with modern zinc-air-technology (1,45 V) are the optimal energy source for all analog and digital hearing aids. They are also ideal for the latest generation of digital devices. Long duration and high capacity: Much attention is given to the excellent performance oft he coin cells: high capacity for a long duration and optimal reliability are guaranteed. Long durability with LGA-test-certificate: The hearing aid batteries offer a reliable performance and a long durability with a very good price-performance-ratio. The shelf-life is about 4 years with rarely no performance deficits. The independent testing institute LGA confirmed the complete and permanent quality of the product. Mercury-free: High-quality and mercury-free, therefore they are especially ecologically.