Myth or Reality? Why you shouldn’t charge your cell phone battery more than 80%…

By Sammy Byron , on November 5, 2022 - 3 minutes to read
Pourquoi il ne faut pas charger la batterie de son téléphone portable à plus de 80 %

As the functions of the cell phone are activated (GPS, bluetooth, data, synchronization), the level of the battery begins to drop. Depending on the equipment, the charging time can vary between one and three hours. In this article, we will give you our best tips and recommendations to make the battery last longer and not wear out with each charge. And we’ll also break down the conventional wisdom. So Myth or Reality?

A Phone Battery that degrades very quickly

With so many uses of the equipment, keeping the battery in good working condition has become a daunting task.

The main recommendation to follow to ensure that the battery does not lose its qualities is to always try to keep it between 20 and 80% of charge.

Exceeding these levels, either above or below, will force the battery to run and may reduce its useful life.

Wireless chargers can be plugged into a laptop or an electrical outlet. Keeping the charge within the recommended limits does not degrade the ionic cells that make up the battery, thus preventing the battery’s life from being shortened.

So let’s bust some of the myths around charging your phone!

The Battery Memory Effect

It is also important to know that the lithium-ion batteries of current cell phones do not have the memory effect that the batteries of the old phones had.

Today, cell phones allow a full 100% charge even when the battery is not completely discharged, without affecting its short or long term life.

Is it good to leave charging overnight?

Going to bed with your phone plugged in is a very convenient way to fall asleep. Most phones today have a 20-hour battery life and take about 3 hours to go from zero to 100.

The question many people have is whether this poses a risk. The truth is that both the chargers and the phones themselves have a intelligent charging system which stops the charge when it reaches the maximum, precisely to avoid damaging the battery.

Therefore, if you leave your phone plugged in all night to have it at 100% in the morning, there is no risk. However, experts point out that when the battery is full and remains plugged in, it receives “trickle charges,” which always keep it fully charged, but also cause a high voltage state.

Optimizing Battery Charge Cycles

Every lithium-ion battery comes with a fixed number of charge cycles, which is the number of times it can go from zero to 100. On average, a phone has a lifespan of between 500 and 700 charge cycles. But that doesn’t mean you can plug it in 500 times.

The key is not to let it run out completely, but to spread it out over several short periods. Keeping it between 40 and 80 percent throughout the day will extend the life of those 500 charges.

Universal or low quality chargers

Low quality chargers, or chargers that are not supplied in the box, may not be able to conduct electrical energy to the battery and may cause its premature deterioration and could damage all or part of its cells.

The main indication that something is wrong is that the phone is heating up or charging, although it indicates that it is active, is not progressing.

In both of these cases, it is highly recommended to unplug your phone!

And if you have any other advice to give us, don’t hesitate to share it in comments or on our social networks!

Sammy Byron

After studying as a specialist in investigative journalism across Europe, I decided to start writing for my own community of Internet users. You can also find my most accurate studies and analyses on the latest trends in the United States. If you are interested in an analysis or a study in collaboration with our Experts, do not hesitate to use the dedicated contact form.


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