Here comes the water bucket analogy again. However, the 3.7 voltage is not sufficient to power those devices that require 5V or more. You use it to power a 5V, 3W clip on fan. This value varies among other types of batteries. Nominal voltage depends on the chemistry of the battery.īattery chemistry and their nominal voltage Chemistryįor lithium-ion batteries, the mid-way point is between 3.6V to 3.7V. This sentence sounds complicated to understand. The nominal voltage is a function of anode and cathode materials, as well as impedance. Why isn't it 1.1V, 2.3V, or any other arbitrary number? You may wonder, why the nominal voltage of a 18650 battery has to be 3.6V or 3.7V. Nominal voltage is often the midpoint of that range.Ĭell manufacturers mark the nominal voltage of their lithium-ion as 3.6V or 3.7V.įor marketing purposes, some manufactures would mark it as 3.7V on the package to imply that it's more powerful. It then drops rapidly to around 3.2V, until it stops working altogether.įrom the graph, you can see that most of the time, it remains at around 3.7V midway through the discharging cycle. It begins at 4.2V and decreases slightly. The voltage of 18650 lithium battery doesn't decrease evenly. So you know that voltage decreases when the battery is running/discharging, and increases again when the battery is being charged. When the water is consumed, the water level declines. Water level, indicating the height of the water, is somehow very similar to voltage.īecause they are both used to gauge the range, difference between the lowest and highest. We can think of the 18650 battery as a bucket of water. Voltage, or electrical pressure, is the difference in electric potential between two points. The next two numbers (65) stand for the height, and the final number (0) means the shape of the battery. The first two numbers(18) refer to the diameter of the battery in millimeters. Just like other lithium-ion cells, the 18650 battery is named after dimensions.
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