Nov 28, 2019 Pageview：3087
The number of 18650 lithium battery represents the external size: 18 represents that the diameter is 18mm, 65 represents that the length is 65mm, and 0 represents the cylindrical battery. It is a standard lithium ion battery model set by Japanese SONY in order to save costs, which is called 18650 lithium battery.
18650 lithium battery pack usually consists of three parts: the 18650 cell, the protective board (commonly called PCM) and the structural component of the shell. The best 18650 lithium battery pack should choose the following three components:
The best 18650 lithium battery pack should be made up of battery cells of well-known brands. Its main capacity is 1800mAh - 3500mAh. The single battery goes through a series of safety and performance tests. After years of quality evaluation, we recommend the following high quality cells:
Top brands of 18650 cell: SAMSUNG, PANASONIC, LG, SANYO, SONY, Lishen, BAK, etc.
The core component of lithium battery protective board is protection IC, composed of PCB, magnetic field effect tube (MOS tube), NTC, PTC, capacitor, resistance, diode, triode, etc.
Overcharge protection: When the voltage of the battery pack is larger than the maximum (overvoltage) value and reaches the protection delay value, the IC control CMOS to shut off the charging circuit.
Overdischarge protection: When the voltage of the battery pack is less than the (undervoltage) maximum value, and reaches the protection delay value, IC control DMOS to turn off the discharge circuit.
Overcurrent and short-circuit protection: When the output current of the battery pack P+ and P- exceeds the overcurrent/short-circuit current value and reaches the overcurrent/short-circuit delay value, the control circuit controls the discharge DMOS to shut 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.
Lithium battery protective board also has functions of power detection, remaining display, battery state display, communication remote control, etc.
According to the requirements of electrical appliances, design the matched shell structures, which tend to be plastic shell, hardware shell, simple PVC thermal shrinkage, etc.
As for 18650 lithium-ion battery pack, exquisite assembly capability is of vital importance. Advanced equipment, skilled technical workers, mature management mode and severe production requirements ensure no error in 18650 lithium-ion battery pack welding, testing, aging, testing before shipment, and so on, and produce the best 18650 lithium-ion battery pack at the end.
Vaping tends to use lithium-ion batteries as power source. Battery life depends on battery type, size, frequency of use and operating environment. Many different battery charger types are available, such as direct socket charger, car charger and USB charger. Currently, 18650 lithium batteries account for the highest proportion of vaping on the market.
Sony VTC4（20~30 A / 2100mAh）
Sony VTC5A（25~30 A / 2500mAh）
Sony VTC6（20 A / 3000mAh）
Samsung INR18650-20S（30 A / 2000mAh）
Samsung INR18650 20R（22 A / 2000mAh）
Samsung 25 R（20 A / 2500mAh）
Samsung INR 18650-30Q（20 A / 3000mAh）
LG HD2C（25 A / 2200mAh）
LG INR 18650HG2（20 A / 3000mAh）
LG 18650 HE2 / HE4（20 A / 2500mAh）
A flashlight is a hand-held electronic lighting tool. Most flashlights on the market use 18650 lithium batteries.
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
4 Bay Digital Charger
Multiple Charging Speeds - 1.5A x 4, 1A x 4 or 2A x 2
Compatible with 18650, 20700, 21700, 26650 and more
3.6V/3.7V Lithium ion Batteries
Input – DC 5V 2.1A
Output Current – .5A x 4 channels or 1A x 2 channels
Charge capacity of both Ni-MH and Li-ion batteries at the same time
Compatible with all sizes of cylindrical lithium-ion batteries ranging from 10440 to 32650
Twice the charging speed of the 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 with and identifies Li-ion (26650, 22650, 18650, 17670, 18490,17500, 18350, 16340(RCR123), 14500, 10440), Ni-MH and Ni-Cd (AA, AAA, AAAA, C) rechargeable batteries
4 Bay Compact Charger
Three charging speeds -1.5A, 1A, or 2A
3.6V/3.7V Lithium-ion Batteries
Most Cylindrical Lithium-ion Batteries Ranging In Size From 10440 To 26650
|Ranking||Cell Model||Maximum Current||Nominal Voltage||Nominal Capacity|
|6||LG hg2 18650||20A||3.6V||3000mAh|
Choose the most suitable 18650 lithium battery according to the condition of electrical equipment, such as the appropriate brand, voltage, capacity, continuous discharge rate, battery life, etc. The most important thing is to choose the battery with good safety performance. Please check the information below:
As for brands, the international famous brands including Sanyo, Samsung, SONY and LG are reliable at present.
Sanyo and LG are featured with conventional applications, such as glare flashlight, power bank and notebook battery.
SONY products aim at large power and high current. Taking VTC4 as an example, its discharge current can reach 30A, which can be used in vaping, electric toys, model aircraft, etc.
The nominal capacity of the 18650 battery is related to its endurance. The unit is mAh. The higher the capacity, the stronger the endurance is. For example, 2800mAh battery can keep discharging for 2 hours at 1.4A.
Continuous discharge capacity is expressed by C. Continuous discharge current = continuous discharge capacity C × capacity
For example, the capacity of an 18650 battery is 2800mAh and the continuous discharge capacity is 0.5c. Then the continuous discharge current is 1.4a. If discharge over 1.4a for a long time, the battery life will be seriously affected and may lead to overheat, burning or even explosion.
The smaller the battery resistance, the less consumption, and the stronger the discharge capacity is. The resistance parameter will be generally written to battery introduction page. If you want to choose and buy a battery, do not buy a battery that has more than 100 m Ω.
Many 18650 batteries used in series must be of the same brand and model. Otherwise, batteries with high internal resistance but low capacity will have bad effect.
Temperature is a major factor affecting the life of 18650 lithium battery. The higher the temperature, the faster the battery aging speed, the higher the temperature, and the greater the damage inside the battery has.
There are flat top and button top 18650 lithium batteries. As the figure below, anode on the left with protruding top is button top battery, while anode on the right without protruding top is flat top battery.
In general, I recommend purchasing button top batteries, because they are compatible for a wide range of devices and applications. The anode and cathode of a flashlight tend to have springs, which can be retractable. But if you want to use flat top batteries in series, the anode of the flat top battery cannot touch the cathode of the other battery.
Button top 18650 battery has protective board, while flat top 18650 battery does not have protective board.
The 18650 lithium battery with protective board is several mm higher than that without protective board, and the price is a little more expensive, but the safety is better and the versatility is stronger. The 18650 lithium battery with protective board can prevent over-discharging, which may cause over-heat, combustion, explosion and other dangers.
When we buy 18650 lithium battery, we will inevitably encounter a lot of fake products in the market. How can we avoid buying fake products?
Choose high-quality suppliers.
Check the workmanship of the battery. The genuine lithium battery shell is made of special material, which is very strong and neat in appearance without extra burrs. The outer surface has certain roughness but feels comfortable, the inner surface feels smooth.
Pay attention to the inspection of brand trademarks, commodity qualification certificates, inspection certificates, etc.
Lithium battery labels use secondary printing technology. In a certain amount of light, it is obvious that the barcode part of the color is darker than the rest when check on the side way.
Battery performance test needs to ensure that the battery performance has passed the test.
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