D battery

A D battery (D cell or IEC R20) is a standardized size of a dry cell. A D cell is cylindrical with an electrical contact at each end; the positive end has a nub or bump. D cells are typically used in high current drain applications, such as in large flashlights, radio receivers, and transmitters, and other devices that require an extended running time. A D cell may be either rechargeable or non-rechargeable. Its terminal voltage and capacity depend upon its cell chemistry.

The National Carbon Company introduced the first D cell in 1898. Before smaller cells became more common, D cells were widely known as flashlight batteries. The U.S. military designation for this battery has been BA-30 since sometime before World War II.^[1] During World War II, it was designated the Type C battery by the U.S. Navy, leading to confusion with the smaller C cell battery (BA-42).

In 2007, D batteries accounted for 8% of alkaline primary battery sales (numerically) in the U.S. In 2008, Swiss purchases of D batteries amounted to 3.4% of primary and 1.4% of secondary (rechargeable) sales.^[2]^[3]

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[2]

[3]

		Zinc–carbon	Alkaline	Li-FeS₂	NiCd	NiMH	Li-SOCl₂
IEC name		R20	LR20	FR20	KR20	HR20	ER? ^{[citation needed]}
ANSI/NEDA name		13D	13A	13LF	13K ^{[citation needed]}	13H ^{[citation needed]}
Typical capacity	milliamphours	8,000 mAh	12,000–18,000 mAh		2,000–5,500 mAh	2,200–12,000 mAh	19,000 mAh
Typical capacity	energy	12 Wh	18–27 Wh		2.5–6.9 Wh	2.75–15 Wh	68.4 Wh ^{[citation needed]}
Nominal voltage		1.5 V	1.5 V	1.5 V	1.25 V	1.25 V	3.6 V
Rechargeable		No	Special type only	No	Yes	Yes	No

Name / Type of this battery		Alkaline	Zinc–carbon	Li-FeS₂	Li-SOCl₂	NiCd	NiMH
IEC name		LR20	R20	FR20	ER? ^{[citation needed]}	KR20	HR20
ANSI/NEDA name		13A	13D	13LF		13K ^{[citation needed]}	13H ^{[citation needed]}

D battery

Dimensions and capacity

Names

Common

Other

Battery capacity

See also

References

External links

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