D Battery

A D battery (also known as a D cell or IEC R20) is a standardized size of a dry cell. It is cylindrical in shape, featuring an electrical contact at each end; the positive end is characterized by a nub or bump. The size and robust design of the D battery make it particularly suitable for high current drain applications, such as in large flashlights, radio receivers, and transmitters. These devices often require an extended running time, making the D battery an ideal choice.

Historical Background

The D battery was first introduced by the National Carbon Company in 1898. Before the advent of smaller battery sizes, D batteries were commonly known as flashlight batteries due to their prevalent use in such devices. The U.S. military has referred to this battery as the BA-30 since before World War II. However, during the war, the U.S. Navy designated it as the Type C battery, which led to confusion with the smaller C cell battery, also known as BA-42.

Applications

D batteries are used in a variety of devices that require significant power output over a longer duration. Typical applications include:

Large Flashlights: Due to their size and capacity, D batteries are preferred for large flashlight models that demand prolonged usage.
Radio Equipment: In both receivers and transmitters, D batteries provide the necessary power for clear and sustained operation.
Toys and Electronics: Some heavier or more power-intensive toys and electronic devices also utilize D batteries to ensure consistent performance.

Market and Sales

In 2007, D batteries accounted for about 8% of alkaline primary battery sales in the United States. This statistic highlights their continued relevance in the market, despite the prevalence of smaller and more compact battery types.

Related Concepts

Electric Battery: Understanding the broader category of electrical power sources, including rechargeable and non-rechargeable types.
List of Battery Sizes: A comprehensive enumeration of primary and secondary battery types used in various applications.
List of Battery Types: Exploration of the types of battery chemistries and applications.
C Battery: A standard size of dry cell battery typically used in medium-drain applications.

D batteries remain an integral component of numerous electronic devices, thanks to their robust capacity and ability to sustain a high current drain, making them essential for both consumer and industrial applications.