Beginner's guide to 18650 battery with easy-to-understand

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Quick Links What Does 18650 Mean Voltage mAH Wh W How to calculate the battery runtime Working principle of lithium-ion battery Construction of lithium-ion battery Reasons behind the safety issues with lithium-ion batteries Difference between flat top and button top Unprotected battery Protected battery Battery sellers should ensure that customers use them properly What Does 18650 Mean Just like other lithium-ion cells, the 18650 battery is named after dimensions. The first two numbers(18) refer to the diameter of the battery in millimeters. The next two numbers (65) stand for the height, and the final number (0) means the shape of the battery. In this case: 18mm Diameter 65mm Height 0 Shape (Cylindrical) Voltage What is voltage Voltage, or electrical pressure, is the difference in electric potential between two points. We can think of the 18650 battery as