The most common 18650 batteries are divided into lithium-ion batteries and lithium iron phosphate batteries. The voltage of the lithium ion battery is 3.6V and 4.2V, and the voltage of the lithium iron phosphate battery is 3.2V. The capacity is generally 1200mAh to 3000mAh, and the most common capacity is 2200 mAh to 3600 mAh.
Since the size of the 18650 lithium battery is fixed, the capacity range with the best stability and consistency is 2600-3000 mAh. If you make a lithium battery, it's better. do not use the highest capacity, regardless of the cost performance and the battery life after assembly is not very cost-effective, so it does not mean that the higher the battery capacity, the more stable and durable it will be.
Notes on 18650 lithium batteries
Do not mix batteries and choosebatteries with constant performance. Replace all batteries when they are low. If used in series, use the same battery type. Pay attention to the polarity of the battery. If the polarity of a battery is reversed, it will reduce the voltage of the entire battery string instead of increasing it.
Keep battery connection points clean. When four batteries are connected in series, there are eight connection points (the connection point from the battery to the battery compartment and the connection point from the battery compartment to the next battery). Each connection point has a certain resistance. If multiple connection points are added, it may affect the performance of the entire battery.
18 is a diameter of 18 mm, 65 is a height of 65 mm and 0 represents a cylindrical battery.
The nominal voltage of a single cell is generally: 3.6 V or 3.7 V
The voltageon charge is typically: 4.20 V (lithium cobalt oxide is 4.2 V to 4.3 V)< p>Minimum end of discharge voltage is typically: 2.75 V. Voltage lower than this voltage can easily lead to a significant reduction in battery capacity or even its disposal.
Maximum charging termination voltage: 4.20 V
Diameter: 18 ± 0.2 mm
Height: 65 ± 2.0 mm
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Capacity: 1000 mAh Above, the conventional capacity is 2200 mAh to 3200 mAh. Currently, LG has the highest 18650 battery capacity, which can reach 3600mAh, but the price is not low.
18650 lithium batteryUsage:
The theoretical life of the 18650 battery is 1,000 charge cycles . Due to their large capacity per unit density, most of them are used in laptop batteries. In addition, as the 18650 has very good stabilityat work, it is widely used in various major electronic fields: often used in high-end, portable, bright flashlights. Power supplies, wireless data transmitters, electric thermal clothing and shoes, portable instruments, portable lighting equipment, portable printers, industrial instruments, medical instruments, etc.
Reference to the above content：Baidu Encyclopedia-18650 lithium battery