D batteries (also called LR20 or E91 batteries) are most often used in high current drain electrical devices such as large flashlights, radio receivers, and other appliances that require an extended running time. These batteries are not as popular as AAA or AA type cells, but certainly essential for the right appliances. We offer one of the widest selections of D batteries in the market from leading brands that you know and trust, including Energizer, Duracell, everActive, Maxell, and Procell. A D battery is shaped as a cylinder typically 34.2mm (1.34in) in diameter and 61.5mm (2.42in) high. If you’re looking for quality products at great prices, you’re in the right place.