Intenso Energy Ultra hearing aid batteries are ideally suited for use in all common hearing aids. From behind-the-ear (BTE) hearing aids to high-performance BTE hearing aids and cochlear implants, Intenso's Energy Ultra hearing aid batteries guarantee maximum performance and longevity to ensure the best possible benefit from your applications. The modern zinc-air hearing aid batteries are more environmentally friendly and maintain a constant voltage. Packaged in a blister.