What is fast charging and slow charging of batteries? Is it 1800mah 18650 battery to charge the battery quickly or slowly?

　　Nickel metal hydride batteries also have a memory effect, but it is not as obvious as nickel cadmium batteries. The memory effect is least obvious in lithium batteries.

　　The memory effect is not obvious, which means that it can be charged multiple times, even after every use without too much impact. Therefore, when using nickel-metal hydride batteries, you can generally charge them directly without considering discharge.

　　Of course, from the perspective of extending the service life, a deep discharge can be performed to restore the maximum capacity after charging and discharging about 30-50 times.

　　Discharging is not as simple as AUDIOpHONE said, just connect a small light bulb and wait until it stops lighting up. Doing so will often over-discharge and harm the battery.

　　As we all know, the rated voltage of a nickel-metal hydride battery is 1.2V. When it is fully charged, it actually exceeds this value, usually between 1.4-1.5V. With use, the voltage will gradually decrease. In general use situations, when the voltage is lower than 1V, it is basically unusable, such as WALKMAN, CDDISKMAN, MD, MP3, DC, etc. You can test the voltage of the exhausted battery yourself.

　　Let’s talk about charging. In fact, the most difficult thing to master is charging correctly. Charging is divided into charging current, which is divided into fast charging and slow charging. From the perspective of charging methods, there are differences between constant current charging and pulse charging.

　　Many people have this question, whether fast charging or slow charging is 1800mah 18650 battery. So let’s first take a look at what is fast charging and what is slow charging. Taking the nominal capacity of a battery as 1C, the charging current between 0.1-0.2C is slow charging, >0.2C is fast charging, >0.8C is ultra-fast charging, and <=0.05C is trickle charging. . Taking a 1400MAH nickel-metal hydride battery as an example, the charging current between 140MA and 280MA is slow charging, while the same charging current of 280MA is fast charging for a 700MAH battery. It can be seen that fast charging or slow charging is a relative concept, which is closely related to the capacity of the battery itself.

　　Going back to the previous question, is it 1800mah 18650 battery to go faster or slower? ! In fact, there is no fixed answer to this. Many people think slow is 1800mah 18650 battery and think fast charging will harm the battery. Will fast charging damage the battery? The answer is yes, but the reason is not that high current charging damages the battery as many people think. High current is at best an accomplice. The real cause is heat, which is caused by high current. Excessive temperature has a great impact on battery life. Therefore, large current is not terrible. What is a headache is how to solve the problem of heating.

　　At this point, the concepts of constant current charging and pulse charging are introduced. When charging slowly, basically all chargers use a constant current charging method, so the circuit design is relatively simple and easy to implement. Since the charging current is in the slow range, it will not cause the problem of battery overheating. When it comes to charging with fast current, using the constant current method will undoubtedly not avoid the problem of battery overheating, so the constant current method is abandoned. Instead, the pulse mode is used. It can be seen from the waveform that the output of the charging current is not a straight line, but a sine wave. At the peak of the wave, the current is the largest, and then immediately enters the trough, with almost no current. The purpose of this design is to give the battery a recovery time, thereby reducing the heat generated by large currents and keeping the battery heating at an acceptable level. Most of the fast chargers that cost around a hundred yuan on the market now use this method. Moreover, this type of charger also uses the voltage slope judgment method or the delta judgment method to judge whether the battery is full. Once full, it will automatically switch to trickle charging to avoid damage to the battery due to large current after a period of time. A more famous example is the Jinniu KN5060 charger recommended by netizens to each other. This charger is available in all major electronics markets, and can be purchased for basically between 65 and 70. The workmanship is not very exquisite, but the effect is good, and it is a very cost-effective product.

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