Comparison Between 18650 vs 21700 Battery

by John Smith Learner

We often get questions about the differences between common battery types. Hence the topic! For more information on this. In this topic, we'll talk about the main differences between the two most common types of flashlight batteries. So after reading this thread about 21700 vs 18650 Battery, you can easily decide which type of battery is best for you.

Battery Power Difference 21700 And 18650

The main difference between 21700 and 18650 batteries is their size. Since the 21700 battery is much larger than the 18650 battery, it also has a larger capacity. An 18650 battery has a maximum capacity of about 3500 mAh, while a 21700 battery can output up to 5000 mAh. Of course, more power means more burning hours. This makes the 21700 ideal for extended use when you can't charge the battery in between. For example, imagine a police officer who has to deal with traffic all night. Depending on the type of lighting you use, you may need to pay attention to the brightness of the lighting at night when using 18650 batteries. It would be very easy with a 21700 battery.

More Space, More Power

In addition to the power differences, the larger 21700 also has an advantage. Because it is larger, there is more room to improve the cooling and power characteristics of the battery. 21700 batteries with a capacity of up to 1400 watts. 18650 stops at 800 watts. The difference in capacity ensures that devices using the 21700 battery have more power. Thus, a flashlight with a 21700 battery will burn longer and brighter than a flashlight with an 18650 battery.

An example of the difference between power and ability

Here is a good example of the difference between the two types of batteries. We tested it with the Fenix HT18 hunting flash, 1500 lumens. We used this flashlight because it easily supports both types of batteries with the help of mounts.

Fenix HT18 light mode with 21700 Li-ion battery

• Turbo: 1500 lumens, burning time approx. 1:40 hours*

• High: 500 lumens, burning time approx. 4:15 hours

• Medium: 150 lumens, burning time approx. 20:15 hours

• Low: 30 lumens, burn time 61 hours

• Strobe: 1500 lumens

Fenix HT18 light mode with 18650 Li-ion battery

• Turbo: 1100 lumens, burning time approx. 1:40 hours*

• High: 500 lumens, burning time approx. 2:15 hours

• Medium: 150 lumens, burning time approx. 14:10 hours

• Low: 30 lumens, burning time approx. 53 hours

• Strobe: 1100 lumens

* The burning time of the highest light position is calculated when the lamp is switched on in the highest position. After 2-3 minutes, the light will automatically switch to low mode due to temperature adjustment.

Advantages of 18650 batteries

If you consider all of the above, the 21700 battery seems to be better. On paper this is true, but the 18650 is still a good choice. The 18650 battery is small in size and light in weight. 18650 batteries are also more economical. The amount of light that an 18650 battery can handle is large, and an 18650 battery is much cheaper than its big brother. In terms of capacity and power, the 18650 battery is more than adequate for average flash use.

Conclusion

If you're looking for a good rechargeable battery for your flashlight, we've got you covered. Whether you use the large 21700 battery or the small 18650 battery. We have a wide selection of both. Find the right battery on our battery page.

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Created on Aug 12th 2023 08:24. Viewed 155 times.

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