This article comes from WeChat public account “fruit shell” (ID: Guokr42), author zorange, love fan Authorized release.

When using a laptop, we often worry about using the battery incorrectly and reducing its life. Can it be charged at full charge, do you need to recharge the battery after use … So how to use the battery to ensure its life?

Too long to read the version

  • Lithium batteries do not need to be recharged when they run out.
  • You do n’t need to charge 12 hours for the first few charges.
  • After charging, there is no charging current even if the charging cable is not pulled.
  • Users who often use batteries do not need to worry about plugging in when fully charged. In contrast, high temperature is the battery killer.
  • For users who do not use batteries, they can occasionally unplug the power and use batteries.

    To answer this question, let’s first look at how it can affect the life and capacity of lithium batteries, and how electronic devices now “treat” batteries.

    ▲ Figure |

    What affects battery life?

    Under-voltage, over-voltage, over-current, storage passivation, high and low temperature, charge and discharge aging are all important factors affecting battery life.

    The aging of charge and discharge is mainly a problem of deep charge and discharge and large current charge and discharge, so it is actually not so extreme undervoltage, overvoltage, and overcurrent. It is simply a question of whether the threshold is within or outside the manufacturer’s calibration threshold. At present, lithium battery manufacturers’ trade-offs for these parameters are generally based on guaranteeing the remaining capacity of 60-80% after 300 deep charge and discharge cycles. When this bottom line is reached, generally do not tend to pursue a higher life, but instead Pursuit of capacity and current. This is also consistent with the charging frequency of mainstream electronic products and the life cycle of the product itselfof.


    The abscissa of the voltage and current curve during chip charging is divided into three areas, which are the three stages of “trickle precharge”, “constant current charging”, and “constant voltage charging”

    Users’ use, no matter how good or bad, under normal conditions, does not cause particularly significant damage to lithium batteries. Considering the current frequency of electronic device updates, it is very useful Just fine. So if you don’t think about using it happily, you must pursue the protection of the battery? Next, we will analyze (pì) several common sayings (yáo) …

    Should I use it to power down and recharge?

    About the most widely-used statement on the use of mobile phone and laptop batteries, “it must be powered down and then recharged”, saying that the professional point is to perform deep discharge each time. This statement makes sense in the era of nickel-metal hydride batteries due to the existence of memory effects. But in the age of lithium battery, it is better not to do it deliberately. As you have seen before, in principle, there is no obvious strict limit for deep discharge and over-discharge to under-voltage. Long-term deep and shallow exposure may have a lifespan difference of up to several times. Of course, do not dare to use it when you need the battery, after all, the over-discharge protection of the manufacturer will not seriously damage your battery. All in all, the advice for when to start charging is, Charge it when it’s convenient.

    How many times must I charge for 12 hours?

    Computers and mobile phones can be bought in many places. The first few charges must be enough for 12-24 hours. Because of the existence of a battery charging chip, there will no longer be a charging current when fully charged . Living people ca n’t be tied up by the line, they should pull out when they go. You can pull out if you are full.

    ▲ Figure |

    Do not leave your laptop fully charged and always plugged in?

    Many people think 100% full charge is “overcharge”, but I don’t think it is correct. Shallow charge (not fully charged) will also have a slight benefit to life, but the relative trouble and capacity loss are not worth the benefit. The real problem with 100% fully charged plugs is “storage passivation”. Storage passivation is especially severe at full power. However, for users who charge and discharge the battery at least once a week, this problem is basically not a concern. However, if it is plugged in and used for a full year, it will indeed cause passivation. At the same time, high temperature will greatly accelerate the passivation and aging process.

    So, for users who often use batteries, the suggestion is, Just use it like this, passivation will not be too obvious . Today’s laptops will also perform some debugging according to the user’s usage habits to avoid passivation as much as possible. Just remember, do not use it on quilts, pillows and other things that will block the cooling holes, and do not use it in places where people die of heat all year round-that is the big killer that destroys the battery!

    ▲ Laptop computer |

    Long-term plug-in without battery is harmful to the battery?

    Passivation is indeed a problem for users who rarely use batteries. There are some solutions, such as not filling and removing storage, but the practicality has problems .

    For the method of not being full, since notebook computers generally do not provide the function of not being full when plugged in, it means that the user needs to unplug the power when not fully, and then plug it in after a period of time, and so on. In this way, you will often forget to plug and unplug and become deep charge and discharge. The main thing is that we are users, not slaves, so tired!