Which is better, 21700 or 18650 battery?

Which is better, 21700 or 18650 battery?
The choice between a 21700 and 18650 battery depends on your specific needs. The 21700 battery offers higher capacity and energy density, making it suitable for devices that require longer runtimes. It is commonly used in high-drain applications such as electric vehicles and power tools. On the other hand, the 18650 battery is more widely available and compatible with a wider range of devices. Consider factors such as device compatibility, capacity requirements, and availability when choosing between the two.

Which is better, 21700 or 18650 battery?

Can I use CR123 instead of 18650?
CR123 batteries are not direct replacements for 18650 batteries. They have different dimensions and voltage ratings. CR123 batteries are typically used in cameras, flashlights, and other devices that require high-performance power sources. If your device is designed for an 18650 battery, it is not recommended to substitute it with a CR123 battery. Always use the battery type specified by the device manufacturer for optimal performance and safety.

https://www.redway-tech.com/18650-vs-21700-replacement-and-compatibility-guide