What is 3.2v 21700 Lithium Battery and Why Do We Use Them?

Author: Heather

Jul. 07, 2025

Understanding the Battery and Its Specifications

The battery is a cylindrical lithium-ion battery with a diameter of 21mm and a length of 70mm. It offers a nominal voltage of 3.7V and a capacity of up to 5,000mAh, making it a powerful and efficient energy source. Its energy density ranges between 250 Wh/kg and 300 Wh/kg, depending on the chemistry. These features contribute to its widespread adoption.

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  • In , the market size reached USD 1.2 billion.

  • Projections estimate it will grow to USD 7.9 billion by .

  • A compound annual growth rate of 22.8% highlights its increasing demand.

You’ll find this battery in electric vehicles, power tools, and energy storage systems, where its high capacity and efficiency excel.

Key Takeaways

  • The battery can hold up to 5,000mAh of power. This means it lasts longer than the battery in devices.

  • It has an energy density up to 270 Wh/kg. This makes it great for small but strong energy needs.

  • Picking trusted brands like Samsung and LG gives better performance and dependability.

Part 1: Specifications of the Battery

1.1 Size and Dimensions of the Cell

The cell stands out due to its standardized dimensions of 21mm in diameter and 70mm in length. These measurements make it larger than the widely used cell, which measures 18mm by 65mm. This increase in size allows the to deliver higher energy storage and improved performance.

The larger size of the cell enables it to store more energy, making it ideal for applications requiring high power capacity, such as electric vehicles and industrial battery packs. Its dimensions also contribute to better thermal management, ensuring safer and more efficient operation.

1.2 Voltage and Capacity of the Battery

The battery operates at a nominal voltage of 3.7V, with a full charge voltage of 4.2V and a discharge cutoff voltage of 3.0V. This voltage range aligns with industry standards for lithium-ion batteries, ensuring compatibility with various devices and systems.

The capacity of the battery, ranging from 4,000mAh to 5,000mAh, significantly surpasses that of the cell. This higher capacity allows the to power devices for longer durations, reducing the need for frequent recharging. Whether you’re designing a medical device, a robotics system, or a security system, the battery offers the reliability and endurance you need.

1.3 Chemistry and Energy Density of the Battery

The battery utilizes advanced lithium-ion chemistry, which provides a balance between energy density, safety, and longevity. Depending on the specific chemistry, such as NMC or LCO, the energy density of the ranges from 250 Wh/kg to 300 Wh/kg. This makes it a preferred choice for applications requiring compact yet powerful energy storage solutions.

For example:

  • NMC Lithium battery: Energy density of 160–270 Wh/kg, cycle life of 1,000–2,000 cycles.

  • LCO Lithium battery: Energy density of 180–230 Wh/kg, cycle life of 500–1,000 cycles.

The high energy density of the battery ensures that it can store more energy in a smaller footprint. This feature is particularly beneficial for consumer electronics and infrastructure projects, where space and weight are critical considerations.

Tip: When selecting a battery, consider the specific chemistry to match your application’s energy and cycle life requirements.

1.4 Weight and Durability of the Cell

The cell weighs approximately 60–70 grams, depending on the manufacturer and specific chemistry. While slightly heavier than the cell, this weight increase is justified by its higher capacity and energy density. The robust construction of the ensures durability, making it suitable for demanding environments such as industrial applications and transportation systems.

Its durability also extends to its cycle life, with some chemistries like LiFePO4 offering up to 5,000 cycles. This longevity reduces the total cost of ownership, as you won’t need to replace the battery as frequently. For businesses relying on battery packs for critical operations, the provides a reliable and cost-effective solution.

Part 2: Comparison with Other Battery Types

2.1 vs. : Key Differences in Size and Capacity

When comparing the battery to the , the most noticeable difference lies in their size. The measures 21mm in diameter and 70mm in length, while the is smaller at 18mm by 65mm. This increase in size allows the to store more energy, making it a superior choice for applications requiring higher capacity and longer runtimes.

The battery offers a capacity range of mAh to mAh, significantly higher than the ’s mAh to mAh. This increased capacity translates to longer runtimes, reducing the frequency of recharging. For example, in medical devices like portable ventilators, the ensures extended operation, which is critical in emergency scenarios. Similarly, robotics systems benefit from the higher capacity, enabling longer autonomous operation without interruptions.

Tip: If you’re designing a battery pack for industrial or infrastructure applications, the ’s higher capacity and energy density make it a more efficient choice than the . Explore custom battery solutions here.

2.2 Applications in Packs vs. Other Battery Packs

The battery has revolutionized battery pack design across various industries. Its higher capacity and energy density make it a preferred choice for applications requiring compact yet powerful energy solutions. In electric vehicles, for example, packs offer greater range and efficiency compared to those using cells. Tesla’s adoption of the in its Model 3 highlights its potential to enhance performance in transportation systems. Explore infrastructure battery solutions here.

In consumer electronics, the battery enables slimmer designs without compromising performance. Devices like high-performance laptops and gaming consoles benefit from its compact size and extended runtime.

Industrial applications also leverage the ’s durability and efficiency. Power tools, for instance, require batteries that can withstand high discharge rates and frequent use. The excels in these demanding environments, offering reliability and cost-effectiveness.

Note: If you’re wondering how long does a battery last, its lifespan depends on the specific chemistry and usage conditions. However, with proper maintenance, it can last for several years, making it a worthwhile investment for businesses.

Part 3: Recommended Brands and Models

3.1 Samsung and LG Batteries

Samsung and LG are two of the most trusted names in the lithium-ion battery market. Their cells are known for their high capacity and consistent performance. Samsung’s batteries, such as the Samsung 50E, offer a capacity of up to 5,000mAh, making them ideal for applications requiring extended runtimes. These batteries are widely used in consumer electronics, robotics, and medical devices due to their reliability and energy efficiency.

LG’s batteries, like the LG M50, also deliver exceptional performance. With a similar capacity range, they are designed for high-drain devices and industrial applications. Their robust construction ensures durability, even in demanding environments. Both brands adhere to strict quality standards, making them a safe and efficient choice for your battery packs.

Tip: When selecting a cell from Samsung or LG, consider the specific requirements of your application, such as capacity, discharge rate, and cycle life.

3.2 Panasonic and Tesla Cells

Panasonic and Tesla have set benchmarks in the battery market. Panasonic’s cells are renowned for their safety and longevity. These batteries are commonly used in infrastructure projects and electric vehicles, where reliability is critical. Tesla, on the other hand, has revolutionized the industry with its and cells. Tesla’s batteries, used in the Model 3, offer a 16% increase in driving range compared to older models. Their advanced design also ensures faster charging and enhanced safety.

These features make Panasonic and Tesla batteries a top choice for transportation and industrial applications. Their focus on innovation and sustainability aligns with global energy goals. Explore sustainability initiatives here.

3.3 Other Reliable Manufacturers of Packs

Several other manufacturers also produce high-quality battery packs. Companies like Sony, Sanyo, and EVE Energy have established themselves as reliable players in the market. These brands offer a range of options tailored to specific industries, including security systems and consumer electronics. Their batteries are designed to meet the highest standards of safety and performance.

When choosing a manufacturer, prioritize those with a proven track record in producing high-capacity lithium-ion rechargeable batteries. This ensures that your battery packs deliver optimal performance and longevity. For custom battery solutions, consult experts like Large Power to design packs tailored to your needs.

The battery offers unmatched advantages in capacity, energy density, and industrial versatility. Its higher energy density ensures longer device runtimes and reduced charging frequency. Quick charging capabilities make it ideal for high-capacity battery packs. Choose reputable brands and maintain proper usage practices to maximize the performance of this lithium ion battery in your applications.

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FAQ

1. What makes the battery better than the ?

The battery offers higher capacity (up to 5,000mAh), improved energy density, and longer runtimes. Its larger size also supports better thermal management, enhancing safety and performance.

Tip: Choose the for applications requiring extended operation and higher power output.

2. Can you use batteries in devices designed for cells?

No, the battery is larger and won’t fit in devices designed for cells. Always check your device’s specifications before selecting a battery.

3. How do you maintain a battery for longer life?

Store it in a cool, dry place. Avoid overcharging or deep discharging. Use a compatible charger to ensure safe and efficient charging cycles.

Your Ultimate Guide to Explore the Battery

In this article, we’ll take a deep dive into the features, specifications, and typical applications of batteries. Whether you are a consumer, a manufacturer, or just someone interested in energy storage solutions, this guide will provide you with all the information you need.

Part 1. What is a Battery?

A battery is a type of lithium-ion rechargeable cell. The name “” refers to its physical dimensions: it has a 21mm diameter and 70mm length. This makes it larger than the popular battery, which measures 18mm x 65mm. While the may seem just slightly bigger, its larger size provides substantial benefits in terms of energy storage, power output, and overall performance.

The increased size of the battery means that it can hold significantly more energy compared to its smaller cousins. This results in a longer battery life per charge and improved efficiency in many high-demand devices.

One of the standout features of the is its higher capacity and energy density compared to smaller batteries. This allows it to power larger devices, such as electric vehicles and solar energy storage systems, with more reliable performance and fewer recharges.

Part 2. battery size

As mentioned earlier, the battery is 21mm in diameter and 70mm in length. This cylindrical shape is the same as other lithium-ion cells, but the extra length and diameter allow for greater energy storage. To put it into perspective, a typical battery can store 5,000mAh of charge, whereas the more common battery typically holds between 2,500mAh to 3,500mAh.

This size increase directly correlates with performance improvements. Larger batteries can deliver higher discharge rates, which means that devices using batteries can consume energy at a faster rate without significantly reducing the battery’s lifespan.

It’s also worth noting that the battery is widely used in applications that require both high energy density and compact size. Its ability to deliver more power with less weight makes it perfect for energy-demanding applications like electric vehicles and power tools.

Part 3. Chemistry and structure

The chemistry and internal structure of a battery can vary depending on the manufacturer and its intended application. However, most cells are based on lithium-ion (Li-ion) technology, which is widely used across many types of rechargeable batteries due to its excellent energy density and long lifespan.

There are several types of lithium-ion chemistries that could be used within the format:

  • Lithium Cobalt Oxide (LCO): High energy density but lower safety and lifespan.
  • Lithium Iron Phosphate (LiFePO4): Safer with longer cycles but lower energy density.
  • Nickel Manganese Cobalt (NCM): Provides a balance of energy density, cost, and safety.

The internal structure of the battery consists of several key components:

  • Anode: Usually made from graphite, this component stores the lithium ions during the discharge process.
  • Cathode: Often made from lithium cobalt oxide or similar materials, it releases lithium ions during discharge.
  • Electrolyte: A liquid or gel-like substance that allows the flow of lithium ions between the anode and cathode.
  • Separator: A non-conductive layer that prevents the anode and cathode from coming into direct contact, thus avoiding short circuits.

While batteries come in different chemistries, they all share a similar basic structure that allows them to provide excellent performance in a wide range of applications.

Part 4. Voltage

The voltage of a battery typically varies between 3.6V to 3.7V when it’s in use. However, the voltage will fluctuate depending on its state of charge:

  • Full Charge: The voltage will be around 4.2V.
  • Nominal Voltage: The 3.7V is the average voltage at which most of the battery’s charge is used.
  • Discharge Cutoff: Below 3.0V, the battery will lose its charge completely and may suffer permanent damage if discharged beyond this point.

The nominal voltage of batteries makes them compatible with most devices that use lithium-ion cells, including electric vehicles, flashlights, and drones. It’s important to understand these voltage ranges when selecting chargers and other accessories.

Part 5. Weight

The weight of a battery typically ranges from 50 to 70 grams, depending on the exact chemistry and the manufacturer. While this weight is heavier than that of smaller batteries, the trade-off is the higher capacity and energy density of the .

For example, an battery might weigh only about 40-50 grams, but because the holds more power, it’s heavier. This makes the battery ideal for use in larger devices that need extended run times, like electric vehicles or power tools, where every extra gram is justified by the performance improvements.

Part 6. Energy Density

One of the key advantages of batteries is their energy density. Typically, batteries have an energy density ranging from 250 Wh/kg to 300 Wh/kg, depending on the chemistry used. This is a notable improvement compared to batteries, which usually offer around 180 Wh/kg to 250 Wh/kg.

The higher energy density of the battery allows for longer use times between charges. It also makes these batteries ideal for devices that require both power and portability. For instance, electric vehicles can use cells to store more energy in less space, resulting in longer driving ranges without increasing the size of the battery pack.

Part 7. cell and pack(battery)

A cell refers to an individual battery unit, while a pack is a configuration of multiple cells connected in series or parallel. The pack is typically what you find in larger, power-hungry devices like electric vehicles or solar energy storage systems.

  • Series Connection: This method connects cells end to end to increase the total voltage. For instance, a 3.7V cell connected in series with another would provide a 7.4V pack.
  • Parallel Connection: Cells are connected side by side to increase the overall capacity (mAh). This increases the total energy storage without affecting the voltage.
  • Series-Parallel Combination: This is the most common method, where cells are arranged in both series and parallel to achieve the desired voltage and capacity.

To safely operate a pack, it’s crucial to use a Battery Management System (BMS). The BMS monitors the voltage, temperature, and charge cycles of each individual cell within the pack to ensure safe operation.

Part 8. Typical applications

The battery is used in a variety of high-demand applications, including:

  • Electric Vehicles (EVs): Due to their high energy density and longevity, batteries are being adopted by companies like Tesla for use in their vehicles. These batteries help provide longer driving ranges between charges.
  • Power Tools: Companies like DeWalt and Makita use cells in their cordless power tools for improved runtime and power output.
  • Flashlights: High-performance flashlights use cells for extended run times, allowing users to operate lights for hours on a single charge.
  • E-cigarettes (Vaping): The battery is favored in high-wattage e-cigarettes due to its ability to deliver high current.
  • Drones: Drones that require extended flight times and higher power output rely on batteries for their long-lasting power.

Part 9. battery vs

The most significant difference between the and batteries is their size and capacity. The is larger (21mm x 70mm) compared to the (18mm x 65mm), and this size difference allows the to store more energy.

  • Capacity: The typically holds mAh or more, while the generally maxes out around mAh.
  • Energy Density: batteries have a higher energy density, meaning they can deliver more power for a longer period of time, making them a better choice for high-demand applications.

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vs Battery: What Difference is between them?

Part 10. How long does a battery last?

The lifespan of a battery is generally measured in charge cycles, which refers to the number of times the battery can be charged and discharged before it starts to lose capacity. On average, a battery can last between 500 to charge cycles, depending on its chemistry, usage, and maintenance.

To maximize the lifespan of your battery, avoid deep discharges (below 20% charge) and overcharging (above 100%). Proper storage at moderate temperatures also helps ensure a long lifespan.

Part 11. Charger, charging and maintenance

When charging your battery, make sure to use a compatible charger designed for lithium-ion batteries. A Battery Management System (BMS) is often required for safe charging, especially in battery packs.

Charging Tips:

  • Never leave your battery charging unattended.
  • Use a charger with overcharge protection to prevent battery damage.
  • Store your battery in a cool, dry place to avoid overheating.

Maintenance Tips:

  • Check for signs of wear, such as swelling or leakage.
  • Regularly clean the battery terminals to ensure proper connections.
  • If the battery is not used for an extended period, store it at 40-60% charge.

Part 12. Ufine battery

Ufine, a leading Chinese manufacturer of lithium batteries. They’re known for customizing battery shapes, sizes, capacities, and voltages. Whether you need lithium polymer, cylindrical, or LiFePO4 batteries, Ufine has you covered.

Their batteries are reliable and high-quality, catering to various power needs. If you’re looking for a battery that fits your specific requirements, Ufine is a great option to consider. They combine innovation with practicality, ensuring you get the best power solution for your devices.

Contact us to discuss your requirements of 3.2v Lithium Battery. Our experienced sales team can help you identify the options that best suit your needs.

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