In the use of lithium batteries, it should be noted that after a period of time, the battery will enter a dormant state, when the capacity is lower than normal, and the use time will be shortened. However, the lithium battery is easy to activate, and it can be activated after 3-5 cycles of normal charge and discharge, and the normal capacity can be restored. Because of the characteristics of lithium battery itself, it has almost no memory effect. Therefore, the new lithium battery in the user's mobile phone does not need special methods and equipment in the activation process. Not only in theory, but also from my own practice, it is best to charge this "natural activation" way in a standard way from the beginning.

For the "activation" of lithium batteries, there are many sayings: the charging time must exceed 12 hours, and it must be repeated three times before the battery can be activated. This statement that "the first three charges should last more than 12 hours" is obviously a continuation from the statement of nickel batteries (such as nickel cadmium and nickel hydrogen). So this statement can be said to have been misinformed from the beginning. The charging and discharging characteristics of lithium batteries and Ni-MH batteries are very different. It can be clearly told that all the serious and formal technical materials I have consulted emphasize that overcharge and overdischarge will cause great harm to lithium batteries, especially liquid lithium-ion batteries. Therefore, it is best to charge in a standard time and manner, especially not more than 12 hours. Usually, the charging method introduced in the mobile phone manual is the standard charging method suitable for this mobile phone.

In addition, the mobile phone or charger of lithium battery will automatically stop charging after the battery is fully charged, and there is no so-called "trickle charging" in which the nickel charger lasts 10 hour. In other words, if your lithium battery is fully charged, it is also charged in vain on the charger. 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 verge of danger for a long time. This is another reason why we oppose long-term charging.

In addition, for some mobile phones, if the charger is not removed after charging for a certain period of time, the system will not only stop charging, but also start discharging-charging cycle. Perhaps the manufacturer's practice has its own purpose, but it is obviously unfavorable to the life of batteries and mobile phones/chargers. At the same time, it takes a long time to charge, often at night, but according to the situation of China power grid, the voltage in many places is relatively high at night and fluctuates greatly. As mentioned earlier, lithium batteries are very expensive, and their ability to withstand charging and discharging fluctuations is much worse than that of nickel batteries, which brings additional dangers.

In addition, another aspect that can not be ignored is that lithium batteries are not suitable for overdischarge, and overdischarge is also very unfavorable to lithium batteries. This raises the following questions.

2. When should I start charging for normal use?

In our forum, we can often see this statement, because the number of charging and discharging is limited, so we should use up the battery of the mobile phone as much as possible before recharging. But I found an experimental table about the charge-discharge cycle of lithium-ion batteries, and the data about the cycle life are listed as follows:

Cycle life (10% DOD): >; 1000 times

Cycle life (100% DOD): >; 200 times

Where DOD is the abbreviation of discharge depth. It can be seen from the table that the charging times are related to the depth of discharge, and the cycle life under 10%DOD is much longer than that under 100%DOD. Of course, if it is converted into the actual relative total charge:10% *1000 =100, 100%*200=200, the latter is still better, but the previous netizen's statement needs to be revised: in general, it should be based on the remaining power.

When you need to charge to cope with the upcoming important events, resulting in busy communication, even if the battery still has a lot of remaining power, you only need to charge in advance, because you have not really lost the life of "1" charging cycles, that is, "0.x" times, and often this x will be very small.

The principle of recharging after the battery is used up is not to let you go to extremes. Like charging for a long time, it is generally said that "try to use up the battery of the mobile phone, and it is best to turn it off automatically". In fact, this practice is only on nickel batteries, in order to avoid the memory effect. Unfortunately, it is also popular on lithium batteries today. There have been some examples of people continuing to use their mobile phones without charging after the warning that the battery is low. As a result, the mobile phone in this example did not respond when it was turned on after charging, so it had to be sent to customer service for repair. This is actually because the battery voltage is too low due to excessive discharge, which makes it not have normal charging and starting conditions.

3, the correct way of lithium battery mobile phone.

To sum up, my most important tips for charging and discharging lithium battery mobile phones in use are:

1, charged according to standard time and procedure, for the first three times;

2. When the battery of the mobile phone is low, try to start charging as soon as possible;

3. No special method is needed to activate the lithium battery, which will be activated naturally when the mobile phone is used normally. If we insist on using the popular method of "the first three times 12 hours long charging activation", it is actually not feasible.

Therefore, it is wrong to pursue 12 hour long charging and use lithium battery mobile phone to automatically turn off. If you did it according to the wrong statement before, please correct it in time, maybe it's not too late.

Of course, under the condition that the quality of the protection control circuit of the mobile phone and the charger itself is good, the protection of the lithium battery is quite guaranteed. Therefore, understanding the charging rules is the key, and some concessions can be made in some cases. For example, if you find that your mobile phone must be charged before going to bed at night, you can also start charging before going to bed. The crux of the matter is that you should know what the correct way is and don't deliberately follow the wrong statement.