18650 cells are among the most popular rechargeable lithium-ion batteries. It is easy to find them and they are reasonably priced. It has some clear advantages over the 18650, but it may be more expensive than the 21700 lithium battery.
What are 21700 and 18650 Batteries?
21700 and 18650 batteries are types of rechargeable lithium-ion batteries. They are commonly used in a wide range of devices, including laptops, power tools, electric vehicles, and flashlights.
A 21700 battery measures 21mm in diameter and 70mm in length, while an 18650 battery measures 18mm in diameter and 65mm in length.
21700 batteries are relatively new compared to the widely used 18650 batteries. They offer higher energy density, which means they can store more energy in the same amount of space. This makes them attractive for use in electric vehicles, where space is at a premium, and longer range is desired.
21700 vs 18650 lithium batteries
The 21700 and 18650 batteries are both rechargeable lithium-ion batteries commonly used in various electronic devices.
- Chemistry: Both batteries use lithium-ion technology for power.
- Voltage: They operate at about 3.6 – 3.7 volts.
- Charging: Both can be charged with a standard lithium-ion battery charger.
- Discharging: They can provide quick power for various devices.
- Size: 21700 is a bit bigger (21mm70mm), while 18650 is smaller (18mm65mm).
- Applications: They power things like laptops, flashlights, and electric vehicles.
- Capacity: 21700 stores more energy than 18650.
- Advantages: 21700 is great for high-powered devices, 18650 has less capacity and is not ideal for high-powered gadgets.
Can you charge 21700 batteries in a 18650 charger?
No, it is not recommended to charge 21700 batteries in a charger designed for 18650 batteries. While both batteries use similar lithium-ion technology, the 21700 battery is larger and has a higher capacity and discharge rate than the 18650 battery. This means that the charging current and voltage required for the 21700 battery may be different from what the 18650 charger is designed to provide.
Using an incompatible charger may result in undercharging, overcharging, or overheating the battery, which can cause damage to the battery or even lead to safety hazards. It is important to use a charger that is specifically designed for the type of battery you are using to ensure proper charging and to avoid any potential safety risks. Therefore, it is recommended to use a charger that is specifically designed for charging 21700 batteries.
Does 21700 last longer than 18650?
Yes, in general, a 21700 battery can last longer than an 18650 battery due to its larger size and higher capacity. The larger size of the 21700 battery allows for a higher energy density, which means that it can store more energy than the 18650 battery.
The typical capacity range for a 21700 battery is 3000 – 5000mAh, while the typical capacity range for an 18650 battery is 1500 – 3500mAh. This means that a fully charged 21700 battery can provide more energy and run for a longer period than a fully charged 18650 battery, all other factors being equal.
However, it’s important to note that the actual performance and runtime of a battery depend on various factors, such as the device it’s used in, the discharge rate, and the temperature. In some cases, an 18650 battery may perform better than a 21700 battery in certain applications. Ultimately, the choice between a 21700 and an 18650 battery will depend on the specific requirements and needs of the device or application.
21700 vs 18650 batteries in application
21700 and 18650 batteries have different applications due to their size, capacity, and discharge rates. While they share many similarities, they are not always interchangeable in every device or application. Here are some of the different applications for each battery:
- 21700 battery: The larger size and higher capacity of the 21700 battery make it suitable for applications that require high performance and longer runtimes, such as electric vehicles, power tools, and high-end flashlights. It is also commonly used in rechargeable battery packs for portable power banks and solar energy systems.
- 18650 battery: The smaller size and lower capacity of the 18650 battery make it suitable for smaller electronic devices, such as laptops, digital cameras, and handheld game consoles. It is also commonly used in portable power banks, e-cigarettes, and LED flashlights.
While there may be some overlap in their applications, it’s important to use the battery that is recommended by the manufacturer for the specific device or application to ensure proper performance and safety. Using the wrong battery type or size can lead to overheating, damage, or even safety hazards.
21700 vs 18650 batteries in cost
The cost of 21700 and 18650 batteries can vary depending on a few factors, including the brand, the capacity, and where you purchase them. For example, a Samsung INR21700-30T battery might cost around $8.99, while a LG MJ1 18650 battery could cost around $4.49. (Check Redway 21700 battery wholesale price)
Generally, 21700 batteries tend to be more expensive than 18650 batteries. This is because they have a higher capacity and can power devices for longer periods of time. Additionally, 21700 batteries are less common than 18650 batteries, so they may be harder to find and more expensive.
When choosing a battery for your device, it’s important to consider the cost as well as the capacity. A more expensive battery might last longer than a cheaper one, but it also might not fit your budget. Ultimately, it’s up to you to decide which battery is right for your needs.
Who produce 18650 cells?
18650 cells are produced by several companies around the world. Some of the major manufacturers of 18650 cells include Panasonic， LG Chem， Samsung SDI, Sony, etc. There are many other companies that produce 18650 cells as well, including Chinese manufacture Redway Battery. It’s important to choose a reputable manufacturer when purchasing lithium-ion batteries to ensure quality and safety.
How to choose the correct lithium battery for your electric mobility?
Choosing the correct lithium battery for your electric mobility device requires careful consideration of several factors, including:
- Voltage: The battery’s power level needs to match what your device needs. Check your device’s info or ask the maker about the right power range.
- Capacity: The battery’s size should give you enough power for how far you need to go. Think about how much distance you want to cover on one charge. The battery’s size, weight, and cost can change based on this.
- Discharge Rate: Your battery should let out power fast enough for your device. For speedy devices like e-bikes, you might need a battery that can give a lot of power quickly, especially for going uphill or speeding up.
- Size and Weight: Your battery should fit well and not make your device too heavy or off-balance. It should snugly fit where the battery goes in your device.
- Safety: Think about safety when you’re choosing a lithium battery. Look for batteries that have safety features built-in, like stopping charging when full or protecting from a sudden power drain.
- Compatibility: Your battery should work with your device’s charging system. Some devices need a special kind of battery or charger, so check before buying.
- Budget: Consider how much you want to spend. Bigger and stronger batteries usually cost more, so find the best one that fits your needs without breaking the bank.
If you have no idea or need more professional battery solutions, please feel free to contact the engineer team of Redway Battery.
12V 100Ah LiFePO4 Battery OEM• Cell Optionals: LiFePO4
• Cycle Life: 4,000 cycles (80%DOD @25°C)
• MOQ: 10
• Delivery: 20 Days
• OEM/ODM/Customizable: Yes
• Production/Port: Redway Battery, Guangdong China