Hearing aid batteries come in a variety of different sizes. Let an audiologist show you the different types and sizes of hearing aid batteries available in this free instructionalvideo. Expert: MJ DeSousa Contact: www.listenupcanada.com Bio: MJ DeSousa is Chief Audiologist and one of the founders of ListenUP! and is responsible for staffing and clinical practices, including all Audiology. Filmmaker: Kevin Fletcher