D-cell batteries are frequently used to power large flashlights.
Usually used to power boom boxes and large flashlights, the D cell battery, also known as an LR20 or 13A cell, is the largest commonly available battery. Although D cells are available in a number of different chemistries and in both single-use and rechargeable configurations, all share the same approximate size and nominal voltage output characteristics.
Physical Specifications
A typical D cell battery ranges from 59.5 to 61.5 mm tall, excluding the positive terminal; it is a cylinder with a diameter of 32.3 to 34.3 mm. The positive terminal, or anode, is a circular nub that is no more than 9.5 mm in diameter and at least 1.5 mm tall, perfectly centered on the top panel of the battery. The entire bottom panel of the battery is the negative terminal, or cathode. A typical D cell weighs 145 g and has a volume of 56.4 cubic cm.
General Power Specifications
D cell batteries typically produce a nominal voltage of 1.5 V; rechargeable batteries with nickel-cadmium chemistry produce slightly less voltage. Although each type of D cell produces different levels of power, it will significantly outlast a smaller battery. For instance, a Duracell Ultra AA battery will last about 3 hours when drained at 500 mW, a D cell of the same type will last about 20 hours.
Power Capacity: Duracell MX1300
A Duracell Ultra D-cell battery will last roughly 5 hours when drained at a relatively fast rate of 1 W, equivalent to roughly 0.67 amps. It is a single-use alkaline battery featuring manganese dioxide chemistry.
Power Capacity: Rayovac Heavy Duty
A Rayovac Heavy Duty D-cell battery has a zinc chloride formulation, which is less expensive than manganese dioxide. Although it is much lighter than an alkaline cell -- weighing just 96 g -- it is also much less powerful. With a draw of 0.545 amps, this cell lasts about the same length of time as an alkaline D cell but produces 20 percent less power.
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