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Does leaving a laptop plugged in ruin the battery?

In today’s increasingly sluggish laptop battery market, most users tend to choose laptop more than desktops. Although the positioning of these two products is different, in the current era, the advantages of business office are still greater than those of desktops. but other problems arise. The battery life of the laptop is not enough. Unlike the desktop, it needs to be plugged in to use, but the laptop is always powered on. Will it damage the battery? Using the superficial knowledge in the field of charging, YIIKOO will give you some suggestions.

Laptop battery (lithium battery)

As we all know, compared with traditional nickel-cadmium batteries and nickel-metal hydride batteries, lithium batteries not only have higher power density, shorter charging time and other advantages, but also are favored by major laptop manufacturers.

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When a lithium battery is charging, the lithium ions in the battery move from the positive electrode to the negative electrode to store electrical energy; Oxidation and reduction reactions occur, and in this process, the battery will gradually wear out and its life will gradually decrease.

In the national standard “Safety Requirements for Lithium-ion Batteries and Battery Packs for Portable Electronic Products” (GB 31241-2014), which came into effect on August 1, 2015, according to over-voltage charging protection, over-current charging protection, under-voltage discharging protection, The safety requirements of battery pack protection circuits such as overload protection and short circuit protection, the minimum cycle standard for lithium batteries is that they can still be used normally after 500 cycle tests.

Charge Cycle

Second, isn’t it true that laptops can only be charged 500 times? If the user charges it once a day, will the battery be discarded in less than two years?

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First of all, you need to understand the charging cycle. Taking the lithium-ion battery of a MacBook as an example, it works in a charging cycle. If the used (discharged) power reaches 100% of the battery capacity, you have completed a charging cycle, but not necessarily It does so on a single charge. For example, you might use 75% of your battery capacity throughout the day, then fully charge your device at your leisure. If you used 25% of the charge the next day, the total discharge would be 100%, and two days would add up to one charge cycle; but after a certain number of charges, the capacity of any type of battery diminishes. Lithium-ion battery capacity also decreases slightly with each charge cycle completed. If you have a MacBook, you can go into the settings to see the battery cycle count or battery health.

Does leaving a laptop plugged in ruin the battery?

The answer can be stated directly: there is damage, but it is negligible.

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When the user uses the laptop, it is divided into three states: the laptop battery is not plugged in, the laptop battery is not fully charged, and the laptop battery is fully charged. What needs to be understood is that the lithium battery can only maintain a single state , that is, state of charge or state of discharge.

● Laptop battery unplugged

In this case, a laptop is draining power from its internal battery in the same way that it would, for example, a phone, wireless headset, or tablet, so use counts toward battery charge cycles.

● Laptop battery is not fully charged

In this case, after the laptop is powered on, it uses the power provided by the power adapter and does not pass through the built-in battery; while the battery is in a charging state at this time, it will still be counted as the number of charging cycles.

● Use when the laptop battery is fully charged

In this case, after the laptop is powered on, it still uses the power provided by the power adapter and does not pass through the built-in battery; at this time, the battery is fully charged and will not continue to work; , will still lose part of the energy, and the subtle changes of 100%-99.9%-100% will hardly be observed by the user, so it will still be included in the charging cycle.

● Battery protection mechanism

Nowadays, in the battery management system, there is a protection voltage, which can protect the voltage from exceeding the peak voltage, which also has a certain effect on increasing the battery life.

The battery protection mechanism is to prevent the battery from being in a high-voltage state for a long time, or from being overcharged. In order to prolong the battery life, most of the mechanisms are to start using the battery to supply power when the battery is fully charged to 100%, and the power supply will no longer charge the battery. Start charging again until it drops below the set threshold; or detect the battery temperature. When the battery temperature is too high or too low, it will limit the battery charging rate or stop charging. For example, MacBook in winter is a typical product.

YIIKOO Summary

As for whether the lithium battery will be damaged by being powered on all the time, in general, it is the damage factor of the lithium battery. There are two key factors that will affect the life of the lithium battery: extreme temperature and deep charge and discharge. Although it will not damage the machine, it will damage the battery.

Lithium-ion (Li-ion) due to its chemical characteristics, the battery capacity will gradually decline with the battery use time, aging phenomenon is inevitable, but the life cycle of regular lithium battery products is in line with national standards, there is no need to worry; The battery life factor is related to the computer system power, program software energy consumption and power management settings; and the high or low temperature of the working environment may also cause the battery life cycle to be reduced in a short period of time.

Secondly, over-discharging and over-charging will cause the most damage to the battery, which will cause the electrolyte to decompose, thereby affecting the life of the lithium battery and making it impossible to restore cycle charging. Therefore, it is not necessary to modify the battery mode in the operating system without knowing it. The laptop has preset several battery modes at the factory, and you can choose according to the usage.

Finally, if you need the best maintenance of the laptop lithium battery, the user should discharge the battery to less than 50% every two weeks, so as to reduce the long-term high-power state of the battery, keep the electrons in the battery flowing at all times, and increase the battery activity to prolong the battery life.

Post time: Jun-14-2023