A D-size or D battery is quite bigger than its AAA or AA counterparts. D batteries are also bigger than the C dry cells and are available in both primary and rechargeable types. As with all other batteries, these are dry cells in a cylindrical shape with electrical contacts at either end. D rechargeable batteries are well suited for use in flashlights, transmitters, receivers, paper towel dispensers, and more.
D Battery Types
Primary D batteries are either made of Alkaline, Lithium, Zinc Carbon, or Lithium Iron Disulphide (LiFeS2). Of these, the Zinc-Carbon and LiFeS2 are the purely disposable cells. Alkaline and Lithium batteries come in their rechargeable variants such as Lithium-ion or rechargeable Lithium. Other rechargeable varieties include the Nickel Metal Hydride (NiMH), CR123A rechargeable battery and Nickel Cadmium (NiCad) batteries with nominal voltages.
D Battery Dimensions/Specifications
The standard size of a D battery is from 58.0 to 61.50 mm. The diameter ranges between 33.0 mm and 34.20 mm. The D batteries weigh between 160 and 180 grams. Their replacement sizes include Type 373, FR20, 13LF, 13A, 13D, and so on.
These are large cylindrical disposable batteries used for applications that need occasional power. These are typically used in both high drain and low drain applications, although certain industrial D batteries are used for high drain devices.
Benefits of Primary Batteries
Primary batteries enjoy several benefits such as:
- Ideal choice where recharging is impossible or impractical (forest fire services, rescue missions, and military combat)
- Ideal for a wide range of applications such as vehicle tire pressure gauges, pacemakers, hearing aids, wrist watches, toys, electric keys, remote light beacons, remote controls, animal-tracking, and so on
- Ready for instant use
- Longer storage time
- High specific energy
- Sufficient power density and energy
- Require little or no maintenance
Rechargeable D Batteries
Rechargeable D batteries look similar to their disposable versions. However, they might come with specific chargers in a pack, although in some cases, they don’t. Based on the brand and other specifications, rechargeable D batteries might need special chargers or universal chargers that work on both C and D-size batteries simultaneously. Rechargeable D batteries have a life of about 2-3 years, although the longevity depends on several other factors. They come from in all forms such as NiMH, NiCad, Lithium-ion, other Lithium variants, and more. These are a bit pricier than the primary batteries.
Benefits of D Batteries
- Suits a wide range of applications
- Rechargeable batteries result in lesser waste and pollution
- Can be used multiple times on recharge
- Although the initial cost is high, it works out well in the long run
- Chances of running out of usable batteries are low
- Environmentally friendly
- Higher capacity means they last 2-4 times longer than other dry cells
- Better performance makes them ideal for high drain applications
- Long battery life as the batteries can be recharged up to 500-1000 life cycles
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