To make selection and identification simpler, when designing and manufacturing these top performing hearing aid batteries, Duracell colour coded each size. The Duracell ZA312 size battery has been colour coded brown. Duracell also had ease of use and ease of handling in mind. All Duracell hearing aid batteries are packaged with a long tab for easy handling. When using hearing aids, the assurance that the source of power is reliable, strong and long lasting is imperative. The Duracell ZA10 battery provides dependable, durable and high power energy. These great little hearing aid batteries come in a handy little pocket, or bag size plastic container, so there is never a time you should be caught short. They also feature the Duracell Duralock Power Preserve technology.