Is It Bad to Charge Your Phone Overnight?

bad battery charging all night.

by Alex Gustman

Updated: July 28, 2022

More and more people express “charging” concerns related to their smartphone batteries. We all heard people complaining about their devices losing all the power for only several hours. It is believed that the way you treat lithium-ion battery inside your phone impacts its lifespan drastically.

We all live different lives. Some of us enjoy constant outlet access, whereas the others only have it available at home, typically during the night. They have no other choice but to top up during that time. Should they set up a midnight alarm clock to prevent the power source from overcharging then? To answer this question, let’s see what we know about modern power sources.

Will leaving the phone overnight ruin the battery?

Almost every portable electronic piece manufactured nowadays has a lithium-ion battery installed. It was chosen from the various other types for durability and efficiency. Besides, there is no need to run constant checks on it – the power source can correctly do without people interfering.

The bad news is that every battery can be recharged a limited amount of times. The good news is that this number is high enough to last for one-two years, depending on how actively you use your smartphone. Do you change the device once a new model is released? Then you for sure, there is no reason to worry at all.

However, lithium-ion accumulators don’t like being:

  • frozen which makes them give out less energy and degrade,
  • heated up which speeds up the natural degradation process,
  • completely discharged or fully charged,
  • punctured, which can make them go on fire.

We overcharge power sources by topping up during the night. Well, not exactly. Let’s find out why.

Common charging myths 

There are many types of accumulators, and, as a result, many beliefs are connected to their correct usage. Most common ones for lithium-ion ones are:

  1. Overcharge fear. While it is true that the degradation process speeds up in this case, most phones and batteries are protected by various electronic components against it. However, the device might heat up during a long charging period, speeding up battery degradation. If you leave it under direct sunlight, the power source might be permanently damaged.
  2. Freezing the battery extends its life. The colder the temperature is, the less efficient your battery will become. Besides, doing it often can permanently damage the power source as well.
  3. Discharging to zero and charging up to 100% is useful. Never follow this scenario if you don’t want to kill your battery faster. Don’t hesitate to top when the indicator reaches 20%.
  4. Battery shortens capacity if you start charging before you reach zero. While this might be true for some power source types, it is false for lithium-ion ones. Never do that.
  5. Battery dies every charging cycle, which is topping up to any percent. It is not true since charging from 70% to 100% is only a third of a cycle. 

The desire to have a healthy power source is understandable. However, most charging tips are useless (and sometimes even harmful) unless you control your energy consumption. Check the article How to make your battery last longer to learn more about this.

However, there are certain things you should avoid slowing down power source degradation. Keep them in mind, and don’t worry too much about the battery.

The Best Thing to NEVER Do: Don’t charge a phone when it’s too cold or hot. And don’t put your phone in the freezer.



In this article, we have answered whether it is bad to charge your phone overnight. Night charging does not damage the phone battery. In this case, the biggest concern is that it is not recommended to leave the devices plugged into the socket without your control. In case of fire or short-circuit, you may get damage.

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About the author 

Alex Gustman

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