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48 Rayovac batteries on the Xcell card label, Size 675 Zinc Air Hearing Aid Batteries. We have 4, 6, and 8 packs, but will display only the photos of the 6 packs. We sometimes may substitute 4 or 8 packs if necessary but will always equal 48 batteries. Rayovac Hearing Aid Batteries, are the best selling brand and they claim to have the world's longest lasting hearing aid batteries. Rayovac zinc air batteries come under several names including the xcell label. All these batteries are the same exact quality, only the sub-brand name differs. What matters to the end user is price, service, selection and quality.