ZeniPower hearing aid batteries and cochlear batteries is the only zinc air button battery manufacturer in China. With over 21 years in research and development and a patented unique technology, you will be satisfied with ZeniPower zinc air batteries for the following applications: Hearing aids using zinc air battery size A10 to A675. You can expect fewer battery replacements, clearer tones, less distortion, fewer volume adjustments, and longer service life. New Zenipower Size 13 (10 Dial Cards of 6 Cells each) Best by 2017 Additional Details ------------------------------ Product description: ZeniPower hearing aid batteries and cochlear batteries is the only zinc air button battery manufacturer in China. With over 21 years in research and development and a patented unique technology, you will be satisfied with ZeniPower zinc air batteries for the following applications: Hearing aids using zinc air battery size A10 to A675. You can expect fewer battery replacements, clearer tones, less distortion, fewer volume adjustments, and longer service life.