Rayovac has over a 110 years of expertise in developing hearing aid batteries along with a drive to constantly innovate and evolve means Rayovac hearing aid batteries are synonymous with quality and the supplier of choice. Rayovac Extra Mercury Free size 10 hearing aid batteries, colour coded yellow. Used mainly for the smaller completely in canal (CIC / IIC) and some RIC hearing aids. Up to 4 years of shelf life.1.45v. Please select the quantity you require from the drop down box. Size 10 Yellow color coding Rayovac longest-lasting Battery ever Reliable and effective power source Improved longer tabs for easy removal Wireless approved.