Duracell hearing aid battery size 13 is long-lasting with EasyTab and a mercury-free battery. The EasyTab is extra-long, so it’s simple to handle and replace, and its lightweight packaging is easy to open. It is identified by Orange color packing, which is making it easy to find the size that’s right for you. Duracell hearing aid battery size 13 is used mainly for the Behind-the-Ear (BTE) hearing aids. Typically over 4 years of shelf life.