The number of the 18650 lithium battery represents the overall size: 18 represents the diameter of 18mm, 65 represents the length of 65mm, and 0 represents the cylindrical battery. It is a standard lithium-ion battery model set by SONY in Japan to save costs, called 18650 lithium battery.
The 18650 lithium battery pack is usually composed of three parts: 18650 cells, protective plate (commonly known as PCM) and shell structural parts. The best 18650 lithium battery pack should choose the following three components:
The best 18650 lithium battery pack should be composed of cells from well-known brands. Its main capacity is 1800mAh - 3500mAh. The single cell has undergone a series of safety and performance tests. After years of quality evaluation, we recommend the following high-quality batteries:
Top brands of 18650 batteries: SAMSUNG, PANASONIC, LG, SANYO, SONY, Lishen, BAK, etc.
The core component of the lithium battery protection board is the protection IC, which is composed of PCB, magnetic field effect transistor (MOS tube), NTC, PTC, capacitor, resistor, diode, triode, etc.
Overcharge protection: When the battery pack voltage is greater than the maximum (overvoltage) value and reaches the protection delay value, the IC controls the CMOS to turn off the charging circuit.
Over-discharge protection: When the voltage of the battery pack is less than (under-voltage) the maximum value and reaches the protection delay value, the IC controls the DMOS to turn off the discharge circuit.
Over-current and short-circuit protection: When the output current of the battery pack P+ and P- exceeds the over-current/short-circuit current value and reaches the over-current/short-circuit delay value, the control circuit controls the discharge DMOS to turn off the discharge circuit and stop discharging.
High and low temperature protection: When the temperature sensor reaches the temperature threshold and the protection delay value, the control circuit controls to turn off the charge and discharge MOS tube and stop the charge and discharge.
The lithium battery protection board also has the functions of power detection, remaining display, battery status display, communication remote control and so on.
According to the requirements of electrical appliances, the matching shell structure is designed, mostly plastic shell, metal shell, simple PVC heat shrink, etc.
For the 18650 Li-Ion battery pack, superb assembly capabilities are critical. Advanced equipment, skilled workers, mature management mode and strict production requirements ensure that the welding, testing, aging, and pre-shipment inspection of 18650 lithium-ion battery packs are error-free and produce the best 18650 lithium-ion battery packs . end.
E-cigarettes tend to use lithium-ion batteries as their power source. Battery life depends on battery type, size, frequency of use and operating environment. There are many different battery charger types to choose from, such as direct socket chargers, car chargers and USB chargers. At present, 18650 lithium batteries account for the highest proportion of electronic cigarettes in the market.
Conventional electronic cigarette 18650 lithium battery model
Sony VTC4 (20~30A / 2100mAh)
Sony VTC5A (25~30A / 2500mAh)
Sony VTC6 (20A / 3000mAh)
Samsung INR18650-20S (30A/2000mAh)
Samsung INR18650 20R (22A/2000mAh)
Samsung 25 R (20A / 2500mAh)
Samsung INR 18650-30Q (20A/3000mAh)
LG HD2C (25A/2200mAh)
LG INR 18650HG2 (20A/3000mAh)
LG 18650 HE2/HE4 (20A/2500mAh)
A flashlight is a handheld electronic lighting tool. Most flashlights on the market use 18650 lithium batteries.
Conventional 18650 flashlight lithium battery model
Samsung INR18650-25R 2500mAh 3.6V 20-25A
Samsung INR18650-30Q 3000mAh 3.6V 20A
LG HG2 18650 3000mAh 3.6V 20A
LG HE4 18650 2500mah 3.6V 20A
LG HB6 18650 1500mAh 3.6V 30A/20C
Sony VTC5a 18650 2600mAh 3.7V 25A
Sony VTC4 18650 2100mAh 3.7V 30A
MXJO 18650 3000mAh 35A IMR battery
Multiple charging speeds - 1.5A x 4, 1A x 4 or 2A x 2
Compatible with 18650, 20700, 21700, 26650, etc.
3.6V/3.7V Li-ion battery
Input - DC 5V 2.1A
Output Current – 0.5A x 4ch or 1A x 2ch
Simultaneous charging capacity of NiMH and Li-ion batteries
Compatible with all sizes of cylindrical Li-ion batteries from 10440 to 32650
Twice the charging speed of i2 Charger
Compatible with 1.2V, 3.7V, 4.2V and 4.35V
Compatible with IMR, Li-Ion, LiFePO4, Ni-MH and Ni-Cd batteries
Compatible and recognizes Li-Ion (26650, 22650, 18650, 17670, 18490, 17500, 18350, 16340(RCR123), 14500, 10440), NiMH and NiCd (AA, AAA, AAAA, C) rechargeable batteries
Slot Compact Charger
Three charging speeds - 1.5A, 1A or 2A
3.6V/3.7V Li-ion battery
Most cylindrical lithium-ion batteries range in size from 10440 to 26650
| Ranking | Cell Model | Maximum Current | Nominal Voltage | Nominal Capacity |
| 1 | Samsung 25r | 20A | 3.7V | 2500mAh |
| 2 | Samsung 30q | 20A | 3.6V | 3000mAh |
| 3 | Panasonic ncr18650b | 20A | 3.6V | 3400mAh |
| 4 | Panasonic ncr18650ga | 10A | 3.6V | 3450mAh |
| 5 | Sanyo ncr18650ga | 10A | 3.6V | 3500mAh |
| 6 | LG hg2 18650 | 20A | 3.6V | 3000mAh |
| 7 | Vapcell (VTC5D) | 25A | 3.6V | 2800mAh |
Choose the most suitable 18650 lithium battery according to the situation of the electrical equipment, such as the appropriate brand, voltage, capacity, continuous discharge rate, battery life, etc. The most important thing is to choose a battery with good safety performance. Please check the following information:
In terms of brands, international well-known brands such as Sanyo, Samsung, Sony, and LG are currently reliable.
Sanyo and LG feature regular applications such as bright flashlights, power banks and laptop batteries.
SONY products aim at high power and high current. Taking VTC4 as an example, its discharge current can reach 30A, which can be used in electronic cigarettes, electric toys, aircraft models, etc.
The nominal capacity of the 18650 battery is related to its endurance. The unit is mA. The higher the capacity, the stronger the endurance. For example, a 2800mAh battery can discharge continuously for 2 hours at 1.4A.
The continuous discharge capacity is denoted by C. Continuous discharge current = continuous discharge capacity C × capacity
For example, the capacity of 18650 battery is 2800mAh, and the continuous discharge capacity is 0.5c. Then the continuous discharge current is 1.4a. If the battery is discharged for more than 1.4a for a long time, it will seriously affect the battery life and may cause overheating, burning or even explosion.
The smaller the internal resistance of the battery, the less consumption and the stronger the discharge capacity. The resistance parameters are usually written on the battery introduction page. If you want to buy a battery, don't buy a battery with more than 100mΩ.
Many 18650 cells used in series must be of the same make and model. Otherwise, batteries with high internal resistance but low capacity will have adverse effects.
Temperature is the main factor that affects the life of 18650 lithium batteries. The higher the temperature, the faster the battery ages, and the higher the temperature, the greater the damage to the inside of the battery.
There are flat-top and button-top 18650 lithium batteries. As shown in the figure below, the positive pole with a convex top on the left is a button battery, and the positive pole without a convex top on the right is a flat-top battery.
In general, I recommend buying coin cells as they are suitable for a variety of devices and applications. The anode and cathode of flashlights tend to have springs that stretch and retract. But if flat-top cells are to be used in series, the anode of the flat-top cell cannot touch the cathode of the other cell.
The button 18650 battery has a protective plate, and the flat head 18650 battery has no protective plate.
The 18650 lithium battery with a protective plate is a few millimeters higher than the one without a protective plate, and the price is slightly more expensive, but it is safer and more versatile. The 18650 lithium battery with a protective plate can prevent over-discharge, causing dangers such as overheating, burning, and explosion.
When we buy 18650 lithium batteries, we will inevitably encounter a large number of counterfeit products on the market. How can we avoid buying counterfeit products?
Choose quality suppliers.
Check the workmanship of the battery. The genuine lithium battery case is made of special material, which is very sturdy and has a neat appearance without extra burrs. The outer surface has a certain rough but comfortable feel, and the inner surface feels smooth.
Pay attention to the inspection of brand trademarks, commodity qualification certificates, inspection certificates, etc.
The lithium battery label adopts secondary printing technology. Under certain lighting conditions, when viewed from the side, the color of the barcode part is obviously darker than other parts.
The battery performance test needs to ensure that the battery performance passes the test.
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