Rayovac Size 13 Hearing Aid Batteries (6 Pack), Size 13 Batteries No hearing aid battery lasts longer than Rayovac Size 13 Hearing Aid Batteries. Engineered with an advanced formula, the cells in each mercury-free size 13 battery provide consistent, high-quality performance for power-hungry hearing aid devices. Use these batteries in your listening devices and hearing aids for reliable hearing assistance. Longer, wider tabs make it easier to change the size 13 batteries in your listening device....