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How can we find products that meet the specifications in Linlin's various lithium batteries? We only have to arm our own brains!

Today, we will teach you a lesson about lithium batteries together. We hope that after learning, you can arm yourself and buy legitimate, safe, and long-lasting lithium battery products. From this, we will also learn the maintenance techniques of lithium batteries. Do not recharge after using up the battery!

1、 How to correctly identify the capacity and power of a battery?

Below, we will take the lithium battery used for PSP as an example to illustrate:

From the above PPT, we can see that the power of the battery is the standard for measuring the actual battery life, and a simple mAh unit (unit of electricity) cannot explain the problem at all. But most businessmen and even the media are accustomed to using mAh as a unit of electricity to describe the basic characteristics of batteries, which leads to confusion in understanding the difference between battery capacity and actual battery life.

2、 How to identify lithium battery products with falsely labeled capacity

Next, let's continue using the lithium battery under PSP as an example to illustrate. The PSP factory battery uses lithium polymer cells (LI-POLYMER), which are slightly thinner than commonly used cells in industry. As for the lithium polymer battery we mentioned today, it is actually just a type of lithium battery, and there are also older lithium-ion batteries. Compared to the other two, the advantages of lithium polymer batteries are as follows:

1. Using solid electrolytes instead of liquid electrolytes, polymer lithium-ion batteries have advantages such as thinning, arbitrary area, and arbitrary shape compared to liquid lithium-ion batteries. They also do not have safety issues such as leakage, combustion, and explosion. Therefore, aluminum-plastic composite films can be used to manufacture battery casings, which can improve the specific capacity of the entire battery;

2. Polymer lithium-ion batteries can also use polymers as positive electrode materials, which will increase their mass to energy ratio by more than 50% compared to current liquid lithium-ion batteries.

3. Polymer lithium-ion batteries have improved working voltage, charge discharge cycle life, and other aspects compared to lithium-ion batteries.

Now, let's take a look at the common knowledge of batteries in the industry:

There is also a cylindrical lithium battery cell (numbered 18650, with a diameter of 8mm, a length of 650mm, and a working voltage of 3-7V), with a maximum capacitance of 2400mAh (usually 1800-2200mAh). Both are common lithium batteries, but 18650 batteries are commonly used in laptops, so we will not explain them in detail here. 18650 lithium battery cell, 3, 7V, 1800-2400mAh

3、 What are the correct habits for charging lithium batteries?

Regarding the charging habits of lithium batteries, a slight Google or Baidu search may reveal two answers. One is to try to use it up before charging, and the other is to charge it casually. Which of these two answers is correct? We have to first understand some common sense.

The charging habits of users towards lithium batteries actually depend on the memory effect of the battery. Before the development of lithium batteries, rechargeable batteries made from materials such as nickel zinc, nickel cadmium, nickel hydrogen, etc. all had strong memory effects. If the battery was repeatedly charged for a long time with a large amount of remaining power, it would result in the battery's storable capacity decreasing. But after the introduction of lithium batteries, the memory effect was greatly reduced, and experts generally use the term 'can ignore' to express it.

Although it can be ignored, the number of times lithium batteries can be recharged is also limited, generally ranging from 500 to 1000 times. Therefore, maintenance has become a key factor in the lifespan of lithium batteries. Based on the characteristics of lithium batteries, we summarize maintenance techniques into the following points:

1. Do not let the lithium battery charge less than 3% (it is recommended to start charging below 20%)

2. When the battery level of a lithium battery is 1%, it can become a deep discharge and must be avoided. Because deep discharge directly affects the service life of lithium batteries.

3. When lithium batteries are not used for a long time (more than 3 months), they should be charged to 50% of their capacity for storage.

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