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When using lithium batteries, it should be noted that after being left for a period of time, the battery enters a sleep state. At this time, the capacity is lower than the normal value, and the usage time is also shortened. But lithium batteries are easy to activate, as they can be activated and restored to normal capacity after 3-5 normal charging and discharging cycles. Due to the inherent characteristics of lithium batteries, they have almost no memory effect. Therefore, the new lithium battery in the user's phone does not require special methods or devices during the activation process. Not only in theory, but from my own practice, it is best to use the standard method of charging from the beginning, which is a "natural activation" method.

There are many sayings about the "activation" issue of lithium batteries: the charging time must exceed 12 hours and be repeated three times in order to activate the battery. The statement that the first three charges require more than 12 hours of charging is clearly a continuation of nickel batteries (such as nickel cadmium and nickel hydrogen). So this statement can be said to have been a misunderstanding from the beginning. The charging and discharging characteristics of lithium batteries and nickel batteries are very different, and it can be very clear that all the serious formal technical materials I have consulted emphasize that overcharging and overcharging can cause huge damage to lithium batteries, especially liquid lithium-ion batteries. Therefore, it is best to charge according to standard time and methods, especially do not charge for more than 12 hours. Usually, the charging method introduced in the user manual is the standard charging method.

At the same time, long-term charging requires a long time and often needs to be carried out at night. Based on the situation of China's power grid, the voltage at night in many places is relatively high and fluctuates greatly. As mentioned earlier, lithium batteries are very delicate, and their ability to withstand fluctuations in charge and discharge is much worse than nickel batteries, which brings additional risks.

In addition, another aspect that cannot be ignored is that lithium batteries are also not suitable for over discharge, and over discharge is also detrimental to lithium batteries.

Tools/raw materials

Lithium batteries, nickel hydrogen batteries, lithium battery chargers, nickel hydrogen battery chargers

Steps/Methods

When should charging start during normal use

This statement is often seen on forums, as the number of charges and discharges is limited, the battery should be used up as much as possible before charging. But I found an experimental table about the charging and discharging cycles of lithium-ion batteries, and the data on cycle life is listed as follows:

Cycle life (10% DOD):>1000 cycles

Cycle life (100% DOD):>200 cycles

DOD is the English abbreviation for discharge depth. From the table, it can be seen that the number of rechargeable times is related to the depth of discharge, and the cycle life at 10% DOD is much longer than that at 100% DOD. Of course, if we take into account the actual total charging capacity: 10% * 1000=100100% * 200=200, the complete charging and discharging of the latter is still better. However, the previous statement from netizens needs to be corrected: under normal circumstances, you should charge the battery according to the principle of using up the remaining battery power before charging. However, if your battery is expected to last for two hours on the second day, you should start charging in a timely manner. Of course, if you are willing to carry the charger to the office, that's another matter.

When you need to charge to cope with expected inconvenience or conditions that do not allow charging, even when there is still a lot of remaining battery charge, you just need to charge in advance because you have not truly lost "1" charging cycle life, which is only "0. x" times, and often this x will be very small.

The principle of using up the remaining battery power before recharging is not to take you to extremes. A widely circulated saying, similar to long-term charging, is "try to use up the battery as much as possible, and it is best to use automatic shutdown.". This approach is actually just a practice on nickel batteries, aimed at avoiding memory effects. Unfortunately, it has also been passed down on lithium batteries to this day. Due to excessive discharge of the battery, the voltage is too low to meet normal charging and startup conditions.

Correct practices for lithium batteries

In summary, my most important reminder about the charging and discharging issues of lithium batteries during use is:

1. Charge according to standard time and procedure, even for the first three times;

2. When the battery level is too low, it is advisable to start charging as soon as possible;

3. The activation of lithium batteries does not require special methods, and they will naturally activate during normal use. If you insist on using the popular "first three 12 hour long charging activation" method, it will not actually be effective.

Therefore, all practices that pursue 12 to 16 hours of ultra long charging and using lithium batteries for automatic shutdown are wrong. If you have followed the wrong statement before, please correct it in a timely manner, perhaps it is not too late.

Precautions

Under the condition of good protection and control circuit quality of the original charger, the protection of lithium batteries is still quite guaranteed. So understanding the charging rules is the key, and in some cases, some concessions can also be made. For example, if you think the battery must be charged before you go to bed at night, you can also start charging before bedtime. The key to the problem is that you should know what the correct approach is and not deliberately follow the wrong statement.

The lifespan of electricity is generally 300-500 charging cycles. Assuming a complete discharge provides 1Q of electricity, without considering the decrease in electricity after each charging cycle, a lithium battery can provide or supplement a total of 300Q-500Q of electricity during its lifespan. From this, it can be seen that if you charge with 1/2 each time, you can charge 600-1000 times; If 1/3 is used each time to charge, it can be charged 900-1500 times. Similarly, if charging randomly, the number of times is uncertain. In short, no matter how it is charged, the total amount of electricity replenished from 300Q-500Q is constant. So, we can also understand it this way: the lifespan of a lithium battery is related to the total charging capacity of the battery, and not to the number of charges. The impact of deep discharge and shallow discharge on the lifespan of lithium batteries is not significantly different. So, when some manufacturers promote it, they say, "A certain strong lithium battery can be charged more than 1500 times." This is purely deceiving consumers.

In fact, shallow discharge and shallow charging are more beneficial for lithium batteries. Only when the power module of the product is calibrated for lithium batteries, is there a need for deep discharge and deep charging. So, products powered by lithium-ion batteries do not have to be limited to the process. Convenience is the top priority, and you can charge them at any time without worrying about affecting their lifespan.

Nowadays, mobile phones use lithium-ion batteries, so there is no memory effect issue or activation required. The first charge does not require charging for more than 12 hours like nickel batteries, only about 4 hours. The lifespan of ion batteries is only related to the number of charges, and lithium-ion batteries can be charged about 1000 times. The standby time is related to usage. However, the phone seller said that the first three charging times should reach 12 hours. What exactly is going on?

1. How to charge a new battery

When using lithium batteries, it should be noted that after being left for a period of time, the battery enters a sleep state. At this time, the capacity is lower than the normal value, and the usage time is also shortened. But lithium batteries are very spacious

Easy to activate, the battery can be activated and restored to normal capacity after 3-5 normal charging and discharging cycles. Due to the inherent characteristics of lithium batteries, they have almost no memory effect.

Therefore, the new lithium battery in the user's phone does not require special methods or devices during the activation process. Not only in theory, but from my own practice, I have adopted the

The "natural activation" method of charging using standard methods is the best.

There are many sayings about the "activation" issue of lithium batteries: the charging time must exceed 12 hours and be repeated three times in order to activate the battery. This type of "first three charges require charging"

The statement "more than 12 hours" is clearly a continuation of nickel batteries (such as nickel cadmium and nickel hydrogen). So this statement can be said to have been a misunderstanding from the beginning. Lithium and nickel batteries

There are significant differences in the charging and discharging characteristics of lithium-ion batteries, and it can be very clear that all the serious formal technical materials I have consulted emphasize that overcharging and overcharging can have an impact on lithium-ion batteries

Pools, especially liquid lithium-ion batteries, cause significant damage. Therefore, it is best to charge according to standard time and methods, especially do not charge for more than 12 hours for extended periods of time

. Usually, the charging method introduced in the phone manual is the standard charging method suitable for the phone.

In addition, lithium battery phones or chargers will automatically stop charging after the battery is fully charged, and there is no "trickle" charging that nickel chargers refer to as lasting for more than 10 hours. That is to say

If your lithium battery is fully charged and placed on the charger, it is also a white charge. And none of us can guarantee that the characteristics of the battery's charge and discharge protection circuit will never change and the quality will be foolproof,

So your battery will be on the brink of danger for a long time. This is also another reason why we oppose long-term charging.

In addition, for some mobile phones, if the charger is not removed after a certain period of time, the system will not only not stop charging, but also start a discharge charging cycle. perhaps

The manufacturer of this approach has its own purpose, but it is clearly detrimental to the lifespan of batteries and mobile phones/chargers. Meanwhile, long-term charging takes a long time and often needs to be done at night,

Looking at the situation of China's power grid, the voltage at night in many places is relatively high and fluctuates greatly. As mentioned earlier, lithium batteries are very delicate and durable in terms of charging and discharging compared to nickel batteries

The ability to fluctuate is much worse, which in turn brings additional dangers.

In addition, another aspect that cannot be ignored is that lithium batteries are also not suitable for over discharge, and over discharge is also detrimental to lithium batteries. This leads to the following question.

2. When should charging start during normal use

On our forum, we often see this statement, because the frequency of charging and discharging is limited, the phone battery should be used up as much as possible before charging. But I'm looking for

According to an experimental table on the charging and discharging cycles of lithium-ion batteries, the data on cycle life is listed as follows:

Cycle life (10% DOD):>1000 cycles

Cycle life (100% DOD):>200 cycles

DOD is the English abbreviation for discharge depth. From the table, it can be seen that the number of rechargeable times is related to the depth of discharge, and the cycle life at 10% DOD is much longer than that at 100% DOD. of course

If it is equivalent to the actual total charging capacity: 10% * 1000=100100% * 200=200, the complete charging and discharging of the latter is still better, but the previous statement from netizens is that

Make some corrections: Under normal circumstances, you should charge according to the principle of using up the remaining battery power before charging, but if your battery cannot last the entire time on the expected second day

During the day, you should start charging in a timely manner. Of course, if you are willing to carry a charger to the office, that's another matter.

And when you need to charge to cope with important events that are expected to cause busy communication, even when there is still a lot of remaining battery power, you just need to charge in advance,

Because you haven't really lost "1" charging cycle life, which is only "0. x" times, and often this x will be very small.

The principle of using up the remaining battery power before recharging is not to take you to extremes. A widely circulated saying, similar to long-term charging, is "try to use up the battery of your phone as much as possible.",

It is best to use automatic shutdown. This approach is actually just a practice on nickel batteries, aimed at avoiding memory effects. Unfortunately, it has also been passed down on lithium batteries to this day. There used to be

An example of a person continuing to use automatic shutdown despite not charging after receiving a warning of low battery level on their phone. As a result, the phone in this example was later charged and turned on

There was no response and we had to send it to customer service for maintenance. This is actually caused by excessive discharge of the battery, resulting in a low voltage that does not meet normal charging and startup conditions.

3. The correct approach for lithium-ion battery smartphones

To sum up, my most important reminder about the charging and discharging issues of lithium-ion battery phones during use is:

1. Charge according to standard time and procedure, even for the first three times;

2. When there is a low battery prompt on the phone, it is advisable to start charging as soon as possible;

3. The activation of lithium batteries does not require a special method, as they will naturally activate during normal phone use. If you insist on using the popular "first three 12 hour long charging activations"

The method will not actually have any effect.

Therefore, all practices that pursue 12 hours of ultra long charging and use lithium battery phones for automatic shutdown are wrong. If you used to do it according to the wrong statement,

Please correct it in a timely manner, perhaps it's not too late.

Of course, in the case of good protection and control circuit quality of mobile phones and chargers, there is still a considerable guarantee for the protection of lithium batteries. So understanding the charging rules is the key, and in some cases, some concessions can also be made. For example, if you find that your phone must be charged before you go to bed at night, you can also start charging before bedtime. The key to the problem is that you should know what the correct approach is and not deliberately follow the wrong statement.

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