The PowerOne size 10 hearing aid batteries are most popularly used in the smallest of hearing aids and in particular those that fit deep inside the ear canal. As with all size 10 batteries, these come in a yellow packaging and the tabs on the rear of the batteries are also yellow to avoid confusion with other battery sizes. If you are looking for one of the cheapest prices per Power One battery on the Internet then you should choose this great value multi-pack option. Each battery has a shelf life of at least three years so there’s every reason to take advantage of this competitively priced option.