***About whether the battery harms the constant work from the mains and whether it is necessary to constantly remove it from the laptop.***


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## How the laptop battery works

There are two main types of batteries - lithium-ion and lithium-polymer. Nickel-cadmium and nickel-metal hydride batteries are no longer used today, as they are not so reliable and effective. Lithium-ion and lithium-polymer batteries work approximately the same, but have their advantages and disadvantages.

For example, the former have a higher specific power, but they suffer from the wear of the liquid located inside. The latter are usually more reliable, but less energy efficient.

#### The following two statements apply to both types:

1. The battery can not be charged beyond measure. If you leave the laptop plugged into an outlet, it will stop charging when it reaches 100%.
2. Full discharge can cause permanent damage to the battery. This is due to the fact that lithium batteries, unlike nickel-cadmium batteries, do not have a charge profile.

## How the battery generates energy

In lithium batteries, lithium ions are in a free state in a porous anode (negative electrode). When you turn on the power, the ions through the electrolyte move from the anode to the cathode (positive electrode).

***As a result of this process, the battery is discharged. During charging, ions move in the opposite direction, reversing the whole process. So the ions are again in the anode, ready for use.***

## Do I need to remove the battery?

Modern batteries far exceed their old counterparts. They are not subject to overcharging, they have no problems associated with charge profiles. Nevertheless, certain difficulties may arise with them.

>**During a hard work, the laptop connected to the mains supplies more heat. Overheating is one of the main reasons for reducing battery life. Therefore, if you are going to play or edit video for quite some time, then the battery should be better extracted.**

It also makes sense to remove the battery if you are not going to use the laptop for a long time, such as a few weeks. In this case, experts recommend charging up to 40% and disconnecting the battery from the device. So the chemical composition of the lithium cell will remain intact.

## Lithium-ion batteries can get old

 Despite the fact that such batteries are installed in almost every portable device, they are not ideal and are subject to destruction. Over time, energy-generating ions become less effective.

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 The battery has a limited service life. Ions are jammed and no longer effectively pass from the anode to the cathode, which reduces the capacity of the battery. Lithium batteries begin to age immediately after release, with the very first charge. The causes of aging can be the following:

* High voltage. Do not keep the battery constantly charged. Always discharge and charge it, but do not allow deep discharge.
* Heat. If it is above 21 ° C, chemical reactions begin to occur in the battery, which causes it to lose its capacity.
* Low temperature. If it is 0-5 ° C, the battery components may be damaged and the capacity may be reduced. Also, there is a high probability of significant problems when trying to charge the battery.
* Prolonged inactivity. The lithium-ion battery is discharged by approximately 8% per month if stored at 21 ° C. If the temperature is higher, the discharge rate increases. All this leads to a deep discharge.
* Physical shock. The battery can damage the banal fall to the ground.

## Can I extend battery life

In a literal sense, you can not do it. But there are a number of rules, under which the battery will work as long and efficiently:

* Never bring it to a deep discharge.
* Always partially discharge the battery, and then recharge it.
* Avoid high temperatures.
* If possible, charge at low voltage.
* Remove the battery if the laptop is plugged into the outlet for a long time.
* Charge and discharge the battery partially - ideally between 20% and 80-85%.
* With prolonged inactivity, charge the battery to 40% and periodically recharge it.

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