June 27, 2025
In many electronic devices, 18650 and 21700 lithium-ion batteries are widely used battery types.
With the advancement of technology, more and more people are beginning to consider replacing 18650 batteries with 21700 lithium-ion batteries.
Is this replacement feasible? We explore this question through the actual sales success case of Jawepower International.
First of all, the main difference between 18650 and 21700 lithium-ion batteries is volume and capacity.
18650 batteries usually measure 18mm diameter and 65mm length, while 21700 batteries are larger,
measuring 21mm diameter and 70mm length. Due to the larger volume of 21700 lithium-ion batteries,
it usually offers higher capacity, which means it can store more energy.
In a successful case of Jawepower International, a power tool manufacturer decided to replace the 18650 batteries
in its products with 21700 lithium-ion batteries. With this replacement, the company was able to
significantly increase the battery life of the tools, thereby improving the consumer experience.
In addition, the performance of these tools under high load conditions is also improved due to the high discharge rate of 21700 batteries.
However, when making a battery swap, users need to pay attention to the following points:
1. Compatibility: Make sure the device can accommodate the size of the 21700 lithium-ion battery.
Some devices may be designed to only use 18650 batteries. (Q: Does my device support 21700 batteries?)
2. Voltage: The voltages of the two batteries are usually similar, but it is still necessary to confirm that
the replacement will not cause damage to the device. (Q: How does the voltage of the 21700 battery differ from the 18650?)
3. Charger: Make sure to use a charger that is compatible with the 21700 lithium-ion battery to
avoid safety hazards during charging. (Q: Do I need to change the charger?)
4. Safety: The high-capacity 21700 lithium-ion battery requires more attention to safety when using it to ensure that
overcharging, short circuits, etc. are prevented. (Q: How to ensure the safe use of 21700 batteries?)
Jawepower International also found that many consumers were significantly more satisfied with
the product after experiencing this battery swap. Feedback shows that the 21700 lithium-ion battery
not only extends the use time of the equipment, but also improves the overall performance.
In summary, it is feasible to replace 18650 batteries with 21700 lithium-ion batteries, but the premise is to ensure compatibility and safety.
In the case of Jawepower International, the successful replacement not only optimized product performance,
but also enhanced customer brand loyalty. Therefore, for users who want to improve the performance of their equipment,
choosing 21700 lithium-ion batteries is an option worth considering.
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