Please check expiration dates on the back of each card.Powerone hearing aid batteries have extra long tabs allow the user to insert the battery into the hearing aid with ease. Each battery is tested for its electrical and mechanical characteristics in accordance with its specifications.Highly developed film seal for every battery guarantees that the battery does not dry out or drain prematurely. The stainless steel housing provides high-level stability and safe protection against corrosion. Quality steel guarantees maximum product protection.