Which is more cost-effective between 21700 and 18650 batteries?
Hello everyone, today we will talk about 21700 and
18650 lithium batteries and see their respective advantages and disadvantages.
21700 Battery: High Power and Range
Firstly, 21700 batteries are common in power banks and high-power devices. The advantages of this type of battery are high power and strong endurance. Taking the Yiseneng lithium battery as an example, a 24V 44800mAh battery with 120W full power can be used continuously for about 2 hours. Moreover, the charging speed of this type of battery is relatively fast, usually around 4 hours.
18650 battery: a cost-effective and high-volume option
On the other hand, 18650 batteries have a price advantage, with large quantities and lower prices. For example, the Dayi A3 electric drill battery can achieve a voltage of 20V or higher by connecting multiple 18650 batteries in series and parallel, suitable for lux and yn series 120W output. However, this type of battery has a fatal flaw: when the battery is fully charged, it can output 120W of full power, but when the battery capacity decreases, the voltage also decreases, resulting in a gradual decrease in power. For example, dropping from 120W to 100W, and then dropping to 60W after a period of time until there is no power, the total time is about 1 hour and 15 minutes.
Comparison of advantages and disadvantages
Cheap and large quantity: 18650 batteries have a price advantage.
Voltage instability: As the battery capacity decreases, the voltage also decreases, resulting in a decrease in power.
Slow charging: The charging time is relatively long, usually taking more than 4 hours.
False labeling issue: Many batteries may have false labeling, resulting in a discount on actual performance.
Higher cost-effectiveness: The 21700 battery has a better balance between price and performance.
Large capacity batteries are not suitable for carrying on high-speed trains or subways.
Heavy: It feels as heavy as a brick when held in hand.
Slow charging: Pay attention to safety when using assembled bare shoes.
