Ensure every sound and word is heard as clear as ever with the help of the Rayovac Size 13 Hearing Aid Batteries. No hearing aid battery lasts longer based on ANSI/IEC performance tests for size 13. The cells in the Rayovac hearing aid batteries 13 are engineered with an advanced formula that performs in the most power-hungry hearing devices for hours of use. This long-lasting device provides consistent, high-quality performance throughout the life of the battery. It comes in a 24-pack L13ZA-24ZMB model that's .