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Guide to 8D Battery: Deimensions, Applications, AGM VS Lithium

by David Lee 15 Nov 2023
guide of Group 8D Battery

Choosing the right battery for your vehicle or equipment is crucial to ensure optimal performance and longevity. When it comes to heavy-duty applications, group 8D batteries are often the go-to option due to their superior power output and reliability.

In this article, we will delve into the key aspects you need to consider when selecting a group 8D battery for your specific requirements. Whether you need it for marine vessels, RVs, trucks, or industrial applications, this guide will help you make an informed decision.

What is an 8D Battery? 

Group 8D batteries are part of a standard classification system used for various applications, commonly found in heavy machinery, large vehicles, and industrial equipment. These batteries are known for their robust construction, capacity, and high cranking amps, making them suitable for demanding tasks like starting diesel engines and providing continuous power for extended periods.

With dimensions of approximately 21" x 11" x 10" (LxWxH), group 8D batteries are among the largest 12-volt batteries available to consumers. Their larger size allows for more and thicker lead plates inside, resulting in higher capacity and cranking amps compared to other battery groups.

However, this larger size also means that group 8D batteries can weigh between 130-180 pounds. In terms of capacity, they typically offer around 230-300 amp-hours and can deliver an impressive 1,500 cold-cranking amps (CCA). This is only for starting or dual-purpose battery. 

Weight of 8D Battery - Why are They So Large & Heavy?

8D batteries are large because they are designed to store and deliver a significant amount of energy for heavy-duty applications. Here are the main reasons for their size:

  1. High Capacity: 8D batteries have a large capacity, typically ranging from 200 to 300 ampere-hours (Ah) or more. This high capacity requires a larger volume of active materials inside the battery to store and deliver the energy.
  2. Durability and Longevity: These batteries are built with thick plates and robust internal components to ensure they can handle deep discharges and high current demands over long periods. The additional materials needed for durability also contribute to the larger size.
  3. High Power Output: 8D batteries are often used in applications that require high power output, such as marine, RV, and backup power systems. The larger size accommodates more cells and thicker plates, which help deliver the high current necessary for these applications.
  4. Construction and Safety: To prevent overheating and ensure safe operation, 8D batteries require adequate space for proper insulation between cells, as well as to house protective features like reinforced casings and safety vents. This adds to their overall size.

why are group8 batteries so large

LiTime 12V 460Ah Lithium Deep Cycle 8D Battery

Because of these factors, 8D batteries are physically large, making them suitable for applications where space is less of a concern but where high power and reliability are essential.

Weight of 8D Battery

The 8D battery size was originally designed for lead-acid batteries to accommodate thicker lead plates. In lead-acid form, 8D batteries typically weigh between 120 and 180 lbs, which is about the heaviest weight one person can reasonably carry. The extra lead and acid gave these batteries greater capacity and higher cranking amps compared to other battery groups.

However, with the advent of lithium 8D batteries, everything has changed. These modern batteries weigh approximately 80 pounds, making them far more manageable. And that’s just one of the many benefits they offer, which we’ll delve into further.

Are All 8D Batteries 12V?

The majority of 8D batteries on the market are 12V, particularly traditional lead-acid 8D batteries.

Why is this? It’s because 12V has long been the standard voltage for many applications, such as starting car engines, powering marine motors, and running RV electrical systems. For years, manufacturers have built these systems around 12V batteries, making them the default choice for most 8D battery applications. Like LiTime 12V 460Ah and LiTime 12V 400Ah LiFePO4 Lithium 8D Batteries.

However, 12V isn’t the only option available.

With the advancement of lithium battery technology and the growing variety of applications, 8D batteries are now available in 24V, 36V, and even 48V versions. These higher voltage batteries are tailored to meet the specific needs of certain equipment:

1. 24V 8D Battery

Often used in devices that require higher voltage with lower current, such as high-power inverters and solar energy storage systems. Compared to 12V batteries, 24V 8D batteries reduce the current needed for the same power output, improving transmission efficiency and saving on cable size and weight.

2. 36V 8D Battery

Commonly used in electric vehicles or high-performance equipment. The higher voltage allows 36V 8D batteries to power high-output motors more efficiently, enhancing overall performance and optimizing energy use.

3. 48V 8D Battery

Typically found in electric boats, industrial machinery, or large energy storage systems. The 48V setup offers high efficiency and minimal power loss, making it ideal for long-lasting, high-power applications.

Applications of Group 8D Battery

8D batteries are commonly used in a variety of applications that require high power and capacity. Some of the common applications include:

Heavy machinery: 8D batteries are often used in construction equipment, such as excavators, bulldozers, and cranes, due to their ability to provide the necessary power for these demanding applications.

Motorhomes and RVs: 8D batteries are frequently used in motorhomes and RVs as they offer a robust power source for running appliances, lights, and other electrical systems while off-grid.

Commercial trucks: Many commercial trucks, including semi-trucks and delivery trucks, rely on 8D batteries to provide the necessary power for starting the engine and operating various electrical components.

Marine applications: 8D batteries are commonly used in boats and marine vessels to power the onboard systems, such as lighting, navigation equipment, and auxiliary engines.

Industrial backup power systems: Due to their high capacity and power output, 8D batteries are suitable for industrial backup power systems, providing a reliable source of power during outages or emergencies.

Agricultural equipment: Tractors and other agricultural machinery often employ 8D batteries to power the engine and electrical systems required for farming operations.

applications of group8 battery

Dual-Purpose Group 8d Battery VS Deep Cycle Group 8D Battery

A dual-purpose Group 8D battery and a deep cycle Group 8D battery serve different purposes:

Dual-Purpose Group 8D Battery

As the name suggests, these batteries are designed to serve two functions. They can provide a burst of power for starting an engine and also provide a steady supply of power for other electrical systems on board. They are commonly used in applications that require both starting and deep cycling capabilities, such as motorhomes, boats, and recreational vehicles (RVs).

Dual-purpose batteries have the advantages of high cranking power for engine starting and the ability to withstand deep discharges. However, they generally have a lower capacity and cycling capability compared to dedicated deep cycle batteries.

Deep Cycle Group 8D Battery

Deep cycle batteries are specifically designed for applications that require reliable and sustained power over extended periods. They can repeatedly discharge and recharge without significantly affecting battery life. Deep cycle batteries are commonly used in golf carts, electric vehicles, solar power systems, and other applications that require a steady flow of power.

Deep cycle batteries have a higher capacity and are built to handle deep discharges. They are optimized for long-term power delivery and can withstand frequent cycling. However, they may have lower cranking power for engine starting compared to dual-purpose batteries.

How Long Do 8D Battery Last?

The lifespan of an 8D battery can vary depending on several factors, including the type of battery and how it is used and maintained. Let's compare the lifespans of AGM (Absorbent Glass Mat) and lithium-ion 8D batteries:

AGM Batteries: On average, AGM batteries have a lifespan of 3 to 5 years. However, with proper care and maintenance, they can last up to 7 years or more. Regular charging, keeping the battery at full capacity, and avoiding deep discharges can help prolong the lifespan of an AGM battery.

Lithium-ion Batteries: Lithium-ion batteries tend to have a longer lifespan compared to AGM batteries. They can last anywhere between 5 to 10 years or even more, depending on usage and maintenance. Lithium-ion batteries are designed to handle high charge and discharge rates, making them more durable and long-lasting.

lifespan of lithium group8 battery

LiTime 12V 460Ah 8D Lithium Battery

Lead-Acid VS Lithium 8D Battery

Feature Lead-Acid 8D Battery Lithium 8D Battery
Weight 125-150 pounds 70-80 pounds
Lifespan 3-5 years (300-500 cycles) 10-15 years (3,000+ cycles)
Discharge Depth 50% recommended 80-100% without damage
Maintenance Regular maintenance required Virtually maintenance-free
Charging Time 10-12 hours 5-8 hours
Initial Cost Lower upfront cost Higher upfront cost
Long-Term Value More frequent replacements needed Better long-term value
Environmental Impact Contains toxic materials (lead, acid) Less hazardous, longer lifespan
Cold Cranking Amps (CCA) High CCA, suitable for starting engines Lower CCA, better for deep cycling

1. CCA Differences

  • Lead-Acid 8D Battery: Lead-acid batteries generally have higher CCA, making them more suitable for applications where a high current is needed for a short burst, such as starting engines in cold weather.
  • Lithium 8D Battery: Lithium batteries typically have a lower CCA compared to lead-acid batteries. However, they excel in deep-cycle applications where consistent power over time is more important than a short burst of high current.

2. Weight

  • Lead-Acid 8D Battery: Typically weighs 125-150 pounds due to the heavy lead plates and electrolyte solution.
  • Lithium 8D Battery: Weighs around 70-80 pounds, making it significantly lighter and easier to handle.

3. Lifespan

  • Lead-Acid 8D Battery: Generally lasts 3-5 years with a cycle life of around 300-500 cycles.
  • Lithium 8D Battery: Can last 10-15 years with a cycle life of over 4,000 cycles, offering a much longer service life.

4. Capacity and Performance

  • Lead-Acid 8D Battery: Delivers consistent power but must be recharged frequently as it loses capacity over time, and it can only be discharged to 50% without reducing lifespan.
  • Lithium 8D Battery: Provides consistent power throughout its charge, can be discharged up to 80-100% without damage, and maintains capacity over a longer period.

5. Maintenance

  • Lead-Acid 8D Battery: Requires regular maintenance, including checking electrolyte levels and cleaning terminals to prevent corrosion.
  • Lithium 8D Battery: Virtually maintenance-free, with no need for regular checks or upkeep.

6. Charging Time

  • Lead-Acid 8D Battery: Takes longer to charge, often requiring 8-12 hours.
  • Lithium 8D Battery: Charges much faster, often within 2-4 hours.

7. Cost

  • Lead-Acid 8D Battery: Lower initial cost but may require more frequent replacements.
  • Lithium 8D Battery: Higher upfront cost but offers better long-term value due to its extended lifespan and superior performance.

8. Environmental Impact

  • Lead-Acid 8D Battery: Contains toxic materials like lead and sulfuric acid, posing environmental risks if not disposed of properly.
  • Lithium 8D Battery: More environmentally friendly, with less hazardous materials and a longer life that reduces waste.

lead acid vs lithium group8 battery

FAQs about 8D Battery

1. How Many Amp Hours Does An 8d Battery Have?

The amp-hour (Ah) capacity of an 8D battery can vary depending on the specific type and brand. Here’s a general range:

  • Lead-Acid 8D Battery: Typically, a lead-acid 8D battery has a capacity ranging from 200 to 300 amp-hours (Ah) at a 20-hour rate.
  • Lithium 8D Battery: Lithium 8D batteries generally have a similar or slightly higher capacity, usually ranging from 200 to 400 amp-hours (Ah) depending on the manufacturer and design.

The capacity of the battery is one of the key factors to consider when choosing an 8D battery for your application, as it directly affects how long the battery can power a device before needing a recharge.

LiTime provides 8d lithium battery with different capacity including:

LiTime Deep Cycle 8D Lithium Battery Weight
12V 400Ah 86 lbs
12V 460Ah 86 lbs
24V 200Ah 83 lbs
24V 230Ah 86 lbs
36V 100Ah 63.1 lbs
48V 100Ah 80 lbs

 

All of these batteries are featured

  • 4000-15000 life cycles, 10+ years lifespan
  • BCI Group 8D Size
  • BMS Smart Protection: Protect the battery from over-current, over-charging, over-discharging, short circuits and overheating, ensuring its health and peak performance.
  • Quality Assurance: backed up with UL, FCC, CE, RoHS, UN38.3 certificates

lithium group8 battery

2. What are the Differences Between 8D and 4D Battery

First, it’s important to note that 4D and 8D batteries are not the same. The most noticeable difference is their size. A 4D battery is slightly smaller than an 8D. Typically, 4D batteries measure around 21 inches long, 9 inches wide, and 10 inches tall. Despite being smaller, they’re still quite heavy, usually weighing between 100 and 150 pounds.

Due to their smaller size, 4D batteries have less capacity and provide less energy for starting engines in cold weather. Generally, a 4D battery offers about 150 to 220 amp-hours of capacity, with a cold cranking amp (CCA) range of 900 to 1,300 amps.

Keep in mind that these figures can vary depending on the specific battery.

If you’re looking for a more efficient, easier-to-handle, and lighter 4D battery, consider switching from a traditional lead-acid to a lithium 4D battery. Lithium versions can offer up to three times more usable power for extended use and weigh about 70 pounds.

Conclusion

When it comes to heavy-duty applications, selecting the right group 8D battery is essential to ensure the smooth and reliable operation of your machinery.

Remember, choosing a quality group 8D battery will not only enhance performance but also provide longevity and peace of mind for years to come.

David Lee David Lee is a renewable energy consultant and off-grid living enthusiast with extensive experience in designing and implementing independent energy systems. He graduated with a degree in Renewable Energy Engineering from the University of Sydney and has worked on projects worldwide, from remote cabins to sustainable communities. Additionally, he has in-depth knowledge of battery applications in golf carts, helping to enhance their performance and sustainability. Beyond his professional work, David enjoys spending time in nature, exploring sustainable living practices, and sharing his experiences through his writing.
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