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Lithium-ion battery usage
- Jun 15, 2018 -

1, how to charge a new battery,

In the use of lithium batteries, it should be noted that the battery enters hibernation after being left for a period of time. At this time, the capacity is lower than the normal value, and the use time is also shortened. However, the lithium battery is very easy to activate, as long as after 3-5 normal charge and discharge cycles can activate the battery and restore normal capacity. Due to the characteristics of the lithium battery itself, it is determined that it has almost no memory effect. Therefore, the new lithium battery in the user's mobile phone does not require special methods and equipment during the activation process.

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For the "activation" problem of lithium batteries, many arguments are: The charging time must be more than 12 hours, repeated three times in order to activate the battery. This statement that "the first three charges must be charged for more than 12 hours" is obviously a continuation of nickel batteries (such as nickel-cadmium and nickel-hydrogen). This argument is wrong. The charging and discharging characteristics of a lithium battery and a nickel battery are very different. Overcharge and overdischarge can cause great harm to a lithium battery, particularly a liquid lithium ion battery. Therefore, it is best to charge in accordance with standard time and standard methods. In particular, do not charge for more than 12 hours (charger display is full).

In addition, lithium batteries or chargers will automatically stop charging when the battery is full, and there is no so-called “trickle” charging of the nickel charger for 10 hours. No one can guarantee that the characteristics of the battery's charge-discharge protection circuit will never change and the quality will be guaranteed, so your battery will be in danger for a long time. This is another reason why lithium-ion batteries cannot be overcharged.

In addition, another aspect that cannot be ignored is that lithium batteries are also not suitable for over-discharging, and over-discharge is also very disadvantageous for lithium batteries.

2. When should I start charging in normal use?

You can often see this statement, because the number of charge and discharge is limited, so the battery should be used as much as possible to recharge the battery, in fact, the life of lithium batteries has nothing to do with this. The following can be an example of a lithium-ion battery charge and discharge cycle test table, the data on the cycle life are listed below:

Cycle life (50% DOD): >1000 times

Cycle life (100% DOD): >500 times

DOD (depth of discharge), which represents the percentage of battery discharge and the rated capacity of the battery. As can be seen from the table, the number of chargeable 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 the relative total capacity of the actual charging is equivalent to 10%*1000=100,100%*200=200, the latter's full charge/discharge is still better, but in front of the user's statement to do some amendment: in normal Under the circumstances, you should reserve the charge according to the remaining charge of the battery. However, if your battery is unlikely to persist throughout the day on the second day of your expectation, it should start charging in time. Of course, if you want to The charger comes to the office and it's different.

The principle of using the remaining battery power to recharge is not to make you go to extremes. One of the most widely circulated examples of long-term charging is "try to run out of battery power." This approach is actually only a nickel battery, the purpose is to avoid the memory effect occurs, unfortunately it is also circulating in lithium batteries so far. There have been instances where users have been using automatic shutdowns after they have not been charged due to the battery low warning. As a result, the mobile phone in this example did not respond during the subsequent charging and booting, and had to send customer service. This is due to the battery being over-discharged so that the voltage is so low that it does not have the normal conditions for charging and starting.

Do not charge the mobile phone lithium-ion battery too full nor use no electricity, the battery is not used up to charge, will not cause damage to the battery, charging within 2-3 hours is appropriate, not necessarily have to be full. However, the lithium battery should be fully charged (normal charging time) and discharged after 1-2 months or so.

Lithium batteries that are not used for a long time should be stored in a cool and dry place, in a half-powered state (70--80% of full power, if your phone is fully charged, 4 squares, then 3 squares). Full battery storage is dangerous and the battery will be damaged. The battery will be destroyed if it is stored without electricity. Every 3 to 6 months, check whether you want to add electricity.

Lithium-ion batteries can be divided into liquid lithium-ion batteries and polymer lithium-ion batteries according to the electrolyte. The electrolyte of the polymer lithium-ion battery is colloidal and will not flow, so there is no leakage problem and it is safer.