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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.