Rayovac Size 13 Hearing Aid Battery – 16pk Please message with any Questions! Item Details: No hearing aid battery lasts longer than Rayovac Size 13 Hearing Aid Batteries. Engineered with an advanced formula, the cells in these mercury-free hearing aid 13 batteries provide consistent, high-quality performance for power-hungry hearing aid devices. Longer, wider tabs make it easier to change the batteries in your listening device. Convenient packaging includes a reclosable front door that snaps closed easily to protect the remaining batteries, and the secure dial on the back prevents the package from spinning, giving you complete control over each hearing device battery.