One of the main differences between the 26650 and 21700 batteries is their size. The 26650 battery is larger, with a diameter of 26mm and length of 65mm, while the 21700 battery has a diameter of 21mm and length of 70mm. This difference in size can impact the capacity and performance of the battery, as well as its compatibility with certain devices.
Another important factor to consider is the discharge rate of each battery. Generally speaking, the 21700 battery has a faster discharge rate than the 26650 battery.
26650 Battery: An Overview
The 26650 battery is a type of lithium-ion rechargeable battery. It has a cylindrical shape with a diameter of 26mm and a height of 65mm, making it larger and bulkier than the 21700 battery, which has a diameter of 21mm and a height of 70mm.
The 26650 battery is commonly used in high-drain applications such as power tools, electric vehicles, and flashlights. It has a higher capacity than the 18650 battery, which is another popular lithium-ion battery, making it a popular choice for applications that require longer run times.
The table below provides a comparison of the specifications of the 26650 battery and the 21700 battery:
| Specification | 26650 Battery | 21700 Battery |
|---|---|---|
| Diameter | 26mm | 21mm |
| Height | 65mm | 70mm |
| Nominal Voltage | 3.7V | 3.6V |
| Capacity Range | 2000mAh – 6000mAh | 3000mAh – 5000mAh |
| Chemistry | Lithium-ion | Lithium-ion |
| Shape | Cylindrical | Cylindrical |
It’s important to note that the 26650 battery has a lower nominal voltage than the 21700 battery, but it has a larger capacity range. This means that the 26650 battery can deliver more energy over a longer period of time, making it ideal for applications that require sustained power output.
In terms of safety, the 26650 battery is generally considered to be safe when handled and used properly. However, as with any lithium-ion battery, it can be dangerous if mishandled or abused. It’s important to follow the manufacturer’s guidelines for charging, discharging, and storing the battery to ensure safe and reliable performance.
Overall, the 26650 battery is a reliable and powerful lithium-ion battery that is well-suited for high-drain applications. Its larger size and higher capacity make it a popular choice for electric vehicles, power tools, and other applications that require sustained power output.
21700 Battery: An Overview
The 21700 battery is a high-capacity lithium-ion rechargeable battery that has gained popularity in recent years. The proper name for this battery is a “21700 cell.” It has a voltage of 3.7v and a capacity ranging from 3000mAh to 5100mAh.
Compared to the 18650 battery and AA/AAA batteries, the 21700 cell is physically larger, measuring 21mm in diameter and 70mm in length. This larger size allows for higher energy density and longer run times, making it an attractive option for high-performance devices such as electric vehicles and power tools.
The 21700 cell also boasts lower internal resistance, which translates to less heat generation and longer battery life. Additionally, it can handle higher discharge rates, making it suitable for devices that require a lot of power in short bursts.
While the 21700 battery is not as widely available as the 18650 battery, it is becoming more common as more manufacturers adopt this newer technology. Overall, the 21700 battery offers a promising future for high-capacity, high-performance rechargeable batteries.
Comparing the Physical Dimensions
When it comes to choosing between the 26650 and 21700 batteries, one of the factors to consider is their physical dimensions. Both batteries are lithium-ion rechargeable batteries, but they differ in size and shape.
The 26650 battery has a diameter of 26mm and a height of 65mm, while the 21700 battery has a diameter of 21mm and a height of 70mm. This means that the 26650 battery is larger and bulkier than the 21700 battery.
The difference in size between the two batteries can impact the devices they are used in. For example, devices that are designed to accommodate larger batteries may be better suited for the 26650 battery, while devices that require smaller batteries may be better suited for the 21700 battery.
It’s also worth noting that the larger size of the 26650 battery may make it more difficult to find compatible devices. On the other hand, the smaller size of the 21700 battery may make it more versatile and easier to find compatible devices.
In terms of weight, the 26650 battery is also heavier than the 21700 battery. The weight difference may not be significant for some applications, but it’s worth considering for applications where weight is a critical factor.
Overall, the physical dimensions of the 26650 and 21700 batteries are an important factor to consider when choosing between the two. The 26650 battery is larger and bulkier, while the 21700 battery is smaller and more versatile.
Energy Density Comparison
When comparing the energy density of 26650 and 21700 batteries, it is important to consider their respective sizes and capacities.
The 21700 battery is slightly larger than the 18650 battery and has a capacity of around 4,000mAh. In comparison, the 26650 battery has a larger capacity of around 5,000mAh due to its larger size. This means that the 26650 battery can store more energy than the 21700 battery.
However, the energy density of the 21700 battery is higher than that of the 26650 battery. Energy density is the amount of energy that can be stored in a given volume or mass of a battery. The higher the energy density, the more energy can be stored in a smaller space or weight.
A study by the National Renewable Energy Laboratory (NREL) found that the energy density of the 21700 battery is around 250Wh/kg, while the energy density of the 26650 battery is around 200Wh/kg. This means that the 21700 battery can store more energy per unit weight than the 26650 battery.
It is important to note that energy density is not the only factor to consider when choosing between these two batteries. Other factors such as cost, availability, and application-specific requirements should also be taken into account.
Discharge Rates: 26650 vs 21700
When it comes to choosing between the 26650 and 21700 batteries, one of the key factors to consider is their discharge rate. The discharge rate refers to the amount of current that the battery can deliver continuously over a certain period of time.
The 26650 battery has a lower discharge rate compared to the 21700 battery. The 26650 battery typically has a maximum continuous discharge rate of around 20A, while the 21700 battery can deliver up to 30A or more. This means that the 21700 battery is better suited for high-drain applications that require a lot of power, such as electric vehicles, power tools, and high-performance flashlights.
However, it’s important to note that the actual discharge rate of a battery can vary depending on a number of factors, including temperature, age, and the specific application. In addition, using a battery beyond its rated discharge rate can lead to reduced battery life, overheating, and even safety hazards.
Overall, while the 26650 battery may be suitable for some low-drain applications, the 21700 battery is the better choice for high-performance applications that require a high discharge rate.
Battery Life Expectancy
When it comes to battery life expectancy, the 26650 and 21700 batteries are both known for their long-lasting performance. However, the 26650 battery tends to have a slightly longer lifespan than the 21700 battery.
The 26650 battery has a typical lifespan of around 800 cycles, while the 21700 battery has a lifespan of around 500 cycles. This means that the 26650 battery can be recharged and used more times before it starts to degrade and lose its capacity.
It’s important to note that the lifespan of a battery can vary based on several factors, including usage patterns, charging habits, and storage conditions. Proper care and maintenance can help extend the lifespan of both types of batteries.
In terms of capacity retention, both batteries are known for their ability to maintain their capacity over time. The 26650 battery typically has a capacity retention rate of around 80% after 500 cycles, while the 21700 battery has a retention rate of around 75% after 500 cycles.
Overall, while the 26650 battery may have a slightly longer lifespan and better capacity retention, both batteries are reliable options for high-capacity, long-lasting power.
Compatibility with Devices
When choosing between a 26650 and a 21700 battery, compatibility with your device is a crucial factor to consider.
The 26650 battery has been around for longer and is more commonly used in a wider variety of devices. It has a larger diameter of 26mm and a length of 65mm, which may not fit in all devices. However, it has a similar voltage and capacity to the 21700 battery, with an average capacity of around 4000-5000mAh.
On the other hand, the 21700 battery is relatively new and may not be compatible with all devices. It has a smaller diameter of 21mm and a length of 70mm, making it more compact and suitable for smaller devices. However, it has a slightly higher capacity than the 26650 battery, with an average capacity of around 5000-6000mAh.
When choosing between the two batteries, it’s essential to check the compatibility of your device with the battery. Some devices may only be compatible with one type of battery, while others may be compatible with both.
If you’re unsure about the compatibility of your device with a particular battery, it’s best to consult the manufacturer’s specifications or seek advice from a professional.
Overall, compatibility is a crucial aspect to consider when choosing between a 26650 and a 21700 battery. Ensure that the battery you choose is compatible with your device to avoid any damage or safety hazards.
Safety Considerations
When it comes to using any type of battery, safety should always be a top priority. Here are some important safety considerations to keep in mind when using 26650 and 21700 batteries:
Battery Quality
It is important to use high-quality batteries from reputable manufacturers to ensure safety. Low-quality batteries may not have proper safety features and can be more prone to overheating or exploding.
Charging
Always use a charger specifically designed for the type of battery you are using. Do not use chargers that are damaged or not designed for your battery. Overcharging or charging at too high of a rate can cause the battery to overheat and potentially explode.
Storage
When not in use, batteries should be stored in a cool, dry place away from direct sunlight and heat sources. Do not store batteries in a metal container or with other metal objects, as this can cause a short circuit and potentially start a fire.
Handling
Always handle batteries with care and avoid dropping or puncturing them. Do not expose batteries to extreme temperatures or moisture. If a battery becomes damaged or shows signs of swelling or overheating, stop using it immediately and dispose of it properly.
Disposal
When it’s time to dispose of a battery, do so in accordance with local regulations. Do not throw batteries in the trash or incinerate them, as this can release harmful chemicals into the environment. Look for recycling programs or drop-off locations in your area.
By following these safety considerations, you can help ensure a safe and reliable experience when using 26650 and 21700 batteries.
Cost Analysis
When it comes to cost, the 26650 battery is generally more expensive than the 21700 battery. This is because the 26650 battery is less commonly used and therefore has a lower demand. Additionally, the larger size of the 26650 battery means that it requires more materials to manufacture, which also contributes to its higher cost.
However, it’s important to note that the cost of batteries can vary greatly depending on the brand and quality. Some 26650 batteries may be cheaper than certain brands of 21700 batteries, and vice versa. It’s important to do your research and compare prices before making a purchase.
In terms of long-term cost, the 21700 battery may be more cost-effective due to its higher capacity and longer lifespan. This means that you may need to replace the 26650 battery more frequently, which can add up in cost over time.
Overall, while the 26650 battery may be more expensive upfront, it’s important to consider the long-term cost and the specific needs of your device before making a decision.
Conclusion
In conclusion, both the 26650 and 21700 batteries have their own unique features and applications. The 21700 battery is more common and widely used due to its smaller size and higher energy density. On the other hand, the 26650 battery is larger and bulkier, but it has a higher capacity and can handle higher discharge rates.
When it comes to choosing between the two batteries, it ultimately depends on the specific application and requirements. If space is a constraint, the 21700 battery would be a better choice. However, if high capacity and discharge rates are needed, the 26650 battery would be the way to go.
It is important to note that both batteries are lithium-ion batteries and require proper handling and usage to ensure safety and longevity. Always make sure to follow the manufacturer’s guidelines and recommendations for charging, discharging, and storing the batteries.
Overall, both the 26650 and 21700 batteries are reliable and efficient power sources that have their own strengths and weaknesses. It is up to the user to determine which battery is best suited for their specific needs.
Frequently Asked Questions
What is the capacity of 26650 vs 21700 battery?
The capacity of a battery is measured in milliampere-hours (mAh). The 26650 battery has a higher capacity than the 21700 battery. The 26650 battery typically has a capacity of 4000-5000mAh, while the 21700 battery has a capacity of 3000-4000mAh.
What is the difference between 26650 and 18650 battery?
The main difference between the 26650 and 18650 battery is their size. The 26650 battery is larger and has a higher capacity than the 18650 battery. The 26650 battery typically has a capacity of 4000-5000mAh, while the 18650 battery has a capacity of 2000-3500mAh.
Are 21700 and 26650 batteries interchangeable?
No, 21700 and 26650 batteries are not interchangeable. They have different sizes and capacities, and are used in different applications.
What battery can I use instead of 26650?
If you need a battery with similar capacity to the 26650, you can use a 32650 battery. The 32650 battery is larger than the 26650 battery and has a higher capacity.
26650 vs 21700 flashlight
The choice between a 26650 and 21700 flashlight depends on your needs. A 26650 flashlight will typically have a longer runtime and higher output than a 21700 flashlight. However, a 21700 flashlight will be smaller and lighter than a 26650 flashlight.
26650 vs 32650
The main difference between the 26650 and 32650 battery is their size and capacity. The 32650 battery is larger and has a higher capacity than the 26650 battery. The 32650 battery typically has a capacity of 5000-6000mAh, while the 26650 battery has a capacity of 4000-5000mAh.