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Harmful effects of continuous charging plugs for laptops and things to know

Let's look at this question from both the scientific aspects and the advice of the major manufacturers.

Understanding Laptop Battery

Currently, there are 2 main types of laptop batteries: Lithium-ion and lithium-polymer. While these batteries 2 differences exist, they operate in a similar way: Power is created when electrons move. The flow of electrons makes the battery always 'healthy'.

With the above-mentioned two types of batteries, you should note two points:
- Laptop battery can not be damaged when plugged in too long: When you charge the battery up to 100%, the battery will automatically disconnect power and will not continue charging until the battery has dropped to a certain level (for like 95 or 98%).

- To charge the battery exhausted state will damage the battery: If the status is unchanged at 0% for too long, laptop battery will fall into a 'shallow charging' and probably will ... never awoke.

2 Based on this, whether we can conclude is that the laptop plugged continuous battery will keep you safe or not? The answer is 'not so simple'.

What will get damaged lithium batteries?

The nature of lithium batteries is that they are not stable and therefore will continuously decline since the maximum size of the time it is produced. There are many factors causing rapid death lithium battery, including:

- The maximum number of rounds charger: lithium batteries each can only be charged a certain number of turns.

- The level of charging: Charging rate (measured in volt / cell) higher as the battery life is shortened.

- High temperatures: Temperatures between 30 ° C and above will cause damage to your laptop battery.

The two points we need to pay attention at the charge level and temperature is used. Both the two factors can cause damage to the affected batteries separately or combined together.

Optimal charge level

Each cell in rechargeable lithium battery usually has a maximum of 4.20 volts, equivalent to 100% of their capacity. At this level, the battery life of your laptop will be 300 - 500 charges.

The relationship between the charger (left) and the charging ring (middle). Will determine the charge level of gain compared with the maximum battery life as a percentage.

Just fell 0.10 volts / cell, the number of rounds increased almost double rechargeable battery storage but declined. Optimal charge level you achieve will be at 3,92V, enable pin 'survivors' are over charging round 2400-4000. Unfortunately, this level of battery life is only about 58%, ie the time using only reached slightly more than half full when the battery remaining.

Temperature

Regardless of other factors is how to use the temperature up to 30 degrees Celsius will cause reduced battery life. The laptop battery in a car or in a room in the summer heat is obviously a bad idea.

When combined with high charge level, effects of temperature on the battery will be exacerbated. The tests showed that preserving battery at 40% in the 40 degrees Celsius temperature will have a lifespan dropped to 85% within 1 year.

The maximum level% to 40 rechargeable batteries and 100% keep the store at different temperature levels within 3 months.

In similar conditions, at 100% charged battery will reduce the battery life to 65% within 1 year. At normal (25 degrees C), rechargeable lithium battery to 100% battery life is reduced to 80%.

The principle here is quite clear. When removing the battery preservation, you should not let the battery at 100% and the absolute need to avoid high temperatures.

More worryingly, the temperature of the actual process of using that laptop battery will be damaged. Intensive tasks such as gaming or video editing will make use of higher temperatures, not to mention bad thermal design or placing laptops on knee pads will also reduce battery life.

You should disassemble the battery while plugged in?

If temperature issues have important implications to this, we need to learn a different problem: you can not remove the battery when the laptop is plugged in or not?

The strange thing is that each manufacturer to give a different answer. For example, given Acer recommends that you should always remove the battery while using the laptop plugged in. Dell, the claim that the laptop plugged in when still attached battery will not cause any problems. HP stand at between 2 manufacturers when making recommendations that you should only plug the laptop battery continuously for 2 weeks.

Though no longer produced the MacBook has a removable battery, but Apple had to give advice that users should combine battery (removable rechargeable) and use the attached charger, to 'help battery electric current always flows' . The continuous charging plug Apple is going to cause harm.

While manufacturers can bring different perspectives, if you plug your laptop charger continuously, you will not notice the short-term harm, but at 100% battery, after a year of battery life you make pretty much sure will decline. On the contrary, the continuous use of laptop when removing charger will also make the rounds charging significantly reduced after a short time.

Therefore, the final answer will be a solution between the two extremes: you should be plugged into a certain number of times (as in the office, in the classroom) and use the battery at other times (on train, in the living room).

If you're sure that you will never need to use a battery, you can charge the battery up to 40-70% and bring preserved in low temperature environments. In any case, keep in mind not to use the laptop battery when the temperature is room temperature or higher.



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