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1、 The best 18650 lithium battery pack

The numbers 18650 in 18650 lithium batteries represent the external dimensions: 18 represents a diameter of 18mm, 65 represents a length of 65mm, and 0 represents a cylindrical battery. It is a standard lithium-ion battery model established by Japanese company SONY in order to save costs, called 18650 lithium battery.

A 18650 lithium battery pack typically consists of three parts: 18650 cells, a protective board (commonly referred to as PCBA), and a housing structural component. The best 18650 lithium battery pack should choose the following three components:

1. Using high-quality 18650 battery cells

The best 18650 lithium battery pack should be composed of cells from top tier brands, with mainstream capacities ranging from 1800mAh to 3500mAh. Single cell batteries undergo a series of safety and performance tests. After years of quality evaluation, we recommend the following high-quality battery cells:

Global top brand 18650 battery cells: SAMSUNG PANASONIC、LG、SANYO、SONY

China's top tier brand 18650 battery cells: Lishen, Bick, etc

2. Multi functional protection circuit board (PCBA)

The core component of a lithium battery protection board is the protection IC, which consists of the main materials such as PCB, MOSFETs, NTC, PTC, capacitors, resistors, diodes, and transistors.

Overcharge protection: When the voltage of a certain string in the battery pack exceeds the maximum value (overvoltage) and reaches the protection delay, the IC controls the CMOS to turn off the charging circuit.

Overdischarge protection: When the voltage of a certain string in the battery pack is less than the maximum value (undervoltage) and reaches the protection delay, the IC controls the DMOS to turn off the discharge point 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, 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 reaches the protection delay, the control circuit controls to turn off the charging and discharging MOS transistor and stop charging and discharging.

The lithium battery protection board also has functions such as battery level detection, remaining capacity display, battery working status display, and remote communication control.

3. Shell structural components

According to the needs of electrical appliances, design a matching shell structure, usually including plastic shells, hardware shells, simple PVC heat shrink, etc.

4. Exquisite lithium battery PACK technology

For 18650 lithium battery packs, excellent PACK capabilities are crucial. Advanced equipment, skilled technicians, mature management models, and rigorous production requirements are necessary to ensure that there are no omissions in important processes such as welding, testing, aging, and pre shipment testing, and to produce the best 18650 lithium battery packs.

High quality 18650 11.1V 6000mAh special electromagnetic spectrometer low-temperature lithium battery

Product Code: 17AQ022-01

Cell model: 18650/11.1V/2000mAh

Battery specification: 18650-3S3P/11.1V/6000mAh

Product size: 173 × 77 × 20mm (Max)

Working temperature: -40 ℃~+60 ℃

Lithium battery protection: short circuit protection, overcharge protection, overdischarge protection, overcurrent protection.?

Product Features

Seismic and Waterproof: By filling the interior of the fire-resistant PC shell with a seismic resistant structure design, high safety and reliability requirements are achieved;

Low temperature operation: Using low-temperature battery cells to ensure operation at -40 degrees Celsius.

Reliable connection: using gold-plated paired gold finger connectors, fast, safe, and reliable;

The battery pack is safe and equipped with a temperature probe, which can upload temperature information to the upper computer;

Battery pack I2C communication, which can upload parameters such as battery voltage, current, capacity, etc. to the upper computer;

The battery pack has a high cycle life, which conforms to the values of low-carbon, energy-saving, and environmental protection;

2、 The best 18650 lithium battery for electronic cigarettes

Most electronic cigarettes use lithium-ion batteries as their power source. The battery life depends on the type and size of the battery, the number of uses, and the operating environment. And there are many different types of battery chargers to choose from, such as socket direct charging, car charging, and USB interface chargers. Currently, the highest proportion of electronic cigarettes on the market use 18650 lithium batteries.

The model of 18650 lithium battery for conventional electronic cigarettes

1. Sony VTC4 (20 to 30 A/2100 mAh)

2. Sony VTC5A (25 to 30 A/2500 mAh)

3. Sony VTC6 (20 A/3000 mAh)

4. Samsung INR18650-20S (30 A/2000 mAh)

5. Samsung INR18650 20R (22 A/2000 mAh)

6. Samsung 25 R (20 A/2500 mAh)

7. Samsung INR 18650-30Q (20 A/3000 mAh)

8. LG HD2C (25 A/2200 mAh)

9. LG INR 18650HG2 (20 A/3000 mAh)

10. LG 18650 HE2/HE4 (20 A/2500 mAh)

3、 The best 18650 battery cell model

4、 How to choose high-quality 18650 lithium batteries?

Choose the most suitable 18650 lithium battery for our 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 high safety. Below, we will provide a detailed introduction one by one:

1. Brand

Regarding brands, internationally renowned brands such as Sanyo, Samsung, SONY, LG, etc. are currently more reliable.

Sanyo and LG focus on conventional applications, mainly in strong light flashlights, power banks, laptop batteries, etc.

SONY specializes in high power and current. Taking VTC4 as an example, the discharge current can reach 30A, which can easily handle electronic cigarettes, toys, etc.

2. Nominal capacity

The nominal capacity of an 18650 battery is related to its endurance, measured in "mAh". The higher the capacity, the stronger the endurance. For example, a 2800mAh battery can discharge continuously for 2 hours with a current of 1.4A.

3. Continuous discharge current (CDR)

The continuous discharge capacity is represented by the C number, and the continuous discharge current=the continuous discharge capacity C number multiplied by the capacity.

For example, if the capacity of an 18650 battery is 2800mAh and its continuous discharge capacity is 0.5C, then the continuous discharge current is 1.4A. If the discharge exceeds 1.4A for a long time, it will seriously affect the battery life and may pose risks such as overheating, combustion, and explosion.

5. Internal resistance

Internal resistance is the resistance of the battery itself. The smaller the internal resistance, the less it consumes and the stronger its discharge capacity. This parameter is usually written on the battery introduction page. When purchasing, it is also important to pay attention and try not to buy batteries with a resistance of more than 100m Ω.

When using multiple 18650 batteries in series, it is necessary to buy batteries of the same brand and model, otherwise batteries with high internal resistance and low capacity will become a weakness.

6. Temperature

Temperature is a significant factor affecting the lifespan of 18650 lithium batteries. The higher the temperature, the faster the battery ages, and the greater the damage to the battery's interior.

7. Sharp pointed and flat headed

There are two types of 18650 lithium batteries: flat head and pointed head. The positive electrode on the left side with a protrusion is pointed head, while the positive electrode on the right side without a protrusion is flat head.

In general, I recommend purchasing pointed batteries to ensure compatibility with a wider range of devices and applications. Usually, the positive and negative poles of flashlights are designed with springs, which can be extended and retracted. Both pointed and flat batteries can be used. But if a flat head battery is to be used in series, the positive pole of the flat head cannot contact the negative pole of another battery.

8. With and without protective board

Sharp 18650 with protective plate, flat 18650 without protective plate.

The 18650 lithium battery with a protective plate is several millimeters higher and slightly more expensive than the one without a protective plate, but it has higher safety and stronger universality. The 18650 lithium battery with a protective plate can prevent the battery from overdischarging, which can cause the battery to heat up and even pose risks such as combustion and explosion.

5、 How to avoid purchasing counterfeit 18650 lithium batteries?

When purchasing 18650 lithium batteries, we inevitably encounter many counterfeit products on the market. How can we avoid buying fake and inferior products?

1. Choose high-quality suppliers

2. Check the workmanship of the battery. The genuine lithium battery case is made of special materials, which are very sturdy and have a neat appearance without excess burrs. The outer surface has a certain roughness and feels comfortable to the touch, while the inner surface feels smooth to the touch

3. Pay attention to checking brand trademarks, product qualification certificates, testing certificates, etc

The lithium battery label adopts secondary printing technology, and under certain lighting conditions, when viewed from the side, it is obvious that the color of the barcode part is darker than the rest.

4. Battery performance testing must ensure that the battery performance passes the test.

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