18650 and 21700 batteries are two common types of lithium-ion rechargeable batteries used in a variety of applications, including power tools, flashlights, and electronic devices.

The main difference between 18650 and 21700 batteries is their size and capacity. 18650 batteries have a diameter of 18mm and a length of 65mm, while 21700 batteries have a diameter of 21mm and a length of 70mm. Due to their larger size, 21700 batteries have a higher capacity and can provide more power than 18650 batteries.

Here are some other key differences and uses of each battery:

Capacity: 21700 batteries typically have a higher capacity than 18650 batteries, with some models offering up to 5000mAh of capacity. This makes them ideal for high-power devices that require long run times, such as electric vehicles, power banks, and drones.

Voltage: Both batteries have similar voltage ratings of 3.6-3.7V. However, some 21700 batteries have a higher voltage rating of 3.8-4.2V, which can provide more power to devices.

Different specifications: The 18650 lithium -ion batteries capacity is between 1200mAh and 3600mAh, but the technology is generally mature between 2000mAh and 3200mAh. The capacity of 21700 lithium -ion batteries is between 3000mAh and 5000mAh.

Size: The larger size of 21700 lithium ion battery makes them less suitable for smaller devices where space is limited, while 18650 batteries are more compact and can fit in a wider range of devices.

Cost: 18650 batteries are more commonly available and tend to be less expensive than 21700 batteries.

In general, 18650 batteries are a good choice for smaller devices where space is limited and capacity is less of a concern, while 21700 batteries are better suited for larger devices that require more power and longer run times. However, the specific battery you choose will depend on the specific requirements of your device, so it’s important to check the manufacturer’s recommendations and specifications before choosing a battery.

18650 battery application range

18650 batteries are widely used in a variety of applications due to their high energy density, small size, and relatively low cost. Some of the most common applications of 18650 batteries include:

Portable electronic devices: 18650 batteries are commonly used in portable electronic devices such as laptops, smartphones, digital cameras, and handheld gaming devices.

Power tools: Many power tools, such as cordless drills and saws, use 18650 batteries as their power source.

Electric vehicles: 18650 batteries are used in electric vehicles as a source of energy for their motors.

Solar power systems: 18650 batteries can be used in solar power systems as a way to store energy collected from solar panels.

Flashlights and torches: 18650 batteries are a popular choice for high-powered flashlights and torches.

Medical devices: Some medical devices, such as portable oxygen concentrators, use 18650 batteries as their power source.

Uninterruptible power supplies (UPS): 18650 batteries are used in UPS systems to provide backup power in the event of a power outage.

Overall, the versatility and reliability of 18650 batteries make them a popular choice for a wide range of applications.

21700 battery application range

21700 batteries are becoming increasingly popular due to their larger size and higher capacity compared to the more common 18650 batteries. As a result, they are being used in a growing range of applications where high power and long run times are required. Here are some of the most common applications for 21700 batteries:

Electric vehicles: 21700 batteries are being used by many electric vehicle manufacturers due to their high capacity and ability to provide sustained power over long periods of time.

Power banks: Portable power banks that can charge phones and other devices are also being made with 21700 lithium ion battery due to their high capacity and compact size.

Flashlights: 21700 batteries are commonly used in high-performance flashlights that require a lot of power and long run times.

Drones: Due to their high capacity and ability to provide sustained power, 21700 batteries are increasingly being used in drones and other unmanned aerial vehicles.

Solar power storage: 21700 batteries are also used in solar power storage systems that allow homeowners and businesses to store energy generated by solar panels for use later.

Medical equipment: 21700 batteries are used in medical equipment such as portable oxygen concentrators and defibrillators, where high capacity and reliability are critical.

Overall, 21700 batteries are versatile and powerful battery technology that is being used in a wide range of applications where high power and long run times are required.

21700 battery and 18650 battery which is better

There is no straightforward answer to whether 21700 or 18650 batteries are better, as each type of battery has its own advantages and disadvantages depending on the application. Here are some key considerations to keep in mind when comparing 21700 and 18650 batteries: