Railhead Branded 1.5V D Size Alkaline battery. This product may contain mercury. This battery has a shelf life of up to 7 years and an impressive, long-lasting capacity of 2850mAh. With a reputation for quality, it offers a secure seal for improved leak protection and designed the batteries to function in extreme temperatures. This battery contains no added mercury. Consult your local environment authorities for regulations regarding how to properly dispose of products containing mercury.