The exact terminal voltage, capacity, and practical discharge rates depend on cell chemistry however, devices designed for D cells will usually only take 1.2-1.5 V unless specified by the manufacturer. Several different chemistries are used in their construction. Many commonly available size D rechargeable cells are actually sub-C cells in a D-sized holder.ĭ batteries are basically divided into primary and secondary. This effect is generally less pronounced in cells with NiMH chemistry and hardly at all with NiCd batteries. Duracell brand rates its alkaline D cell performance as approximately 20,000 mAh at 25 mA draw but about 10,000 mAh at 500 mA draw. Its weight ranges from 160-180 grams.Ī battery’s capacity depends upon its cell chemistry and current draw. The overall length is 61.5 millimeters (2.42 inches). Dimensions and Weight of D Batteryĭ batteries have a nominal diameter of 33.2 millimeters (1.3 inches). They have significantly higher capacity than AA and even C batteries. D batteries are large batteries, that are typically used in medium-to-high drain applications such as large toys, flashlights, and musical instruments.

The fundamental principle in an electrochemical cell is spontaneous redox reactions in two electrodes separated by an electrolyte, which is a substance that is ionic conductive and electrically insulated.Ī D battery, also known as an R20 battery, is one of many types of single-cell cylindrical batteries. A typical battery consists of one or more voltaic cells. This then provides a source of electromotive force to enable currents to flow in electric and electronic circuits. It converts stored chemical energy into electrical energy through an electrochemical process. An electric battery is essentially a source of DC electrical energy.

C batteries voltage