Rayovac Extra Advanced With the Rayovac Extra Advanced hearing aid batteries, boasting the latest innovation "Air Optimisation" (based on Active Core Plus™ technology), Rayovac has further improved its most powerful battery. Modern hearing aids need to be both durable and reliable. Air optimisation technology controls airflow to provide a constant and reliable power supply, ensuring better performance in all environments. New features of the powerful Rayovac Extra Advanced The new design delivers more energy where it is needed, extending battery life and providing a consistent and accurate listening experience. The peel-off tab is 25% larger than the standard design and ergonomically designed to make it easier to change your hearing aid battery. Technical data