Battery Plugged in Overnight
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Leaving your phone plugged in for charging overnight so you can wake up next morning with 100% battery charged on your smartphone doesn’t seems a bad idea at all. There are certain situations when we have to charge or leave our phone’s battery for charging overnight, for i.e, you just forgot to charge your device at the end of the day, and while going to the bed for sleep your phone battery meter alerts you that your phone has 15% battery left, and that’s a kind of situation when you have no option but to plug your phone for charging overnight because you just don’t want to wake up with an empty battery on your smartphone next day.

However, there are so many people who always get scared at such kind of situation because they know or maybe some one has told them that charging the phone overnight damages the phone’s battery. But, that’s not true for today’s generations smartphones and the shortest answer to this could be Yes, you can leave your phone battery plugged in overnight.

Lithium vs Nickel

The myth was true years ago, when batteries were primarily made of ‘Nickel’ like the Duracell and Energizer. The one major difference between Li-ion and NiMH batteries is the material used to store power on both these type of batteries. Lithium-ion batteries are made of carbon and highly reactive lithium and also capable of storing a lot of energy.

On the other hand, Nickel metal hydride batteries are made of hydrogen to store energy, including nickel and another metal (such as titanium).

Charge and Discharge Cycles

A charge and Discharge cycle is when your phone’s battery gets fully discharge from 100% to 0%. According to Apple’s own support article “Determining battery cycle count for Mac notebooks”

  • A charge cycle happens when you use all of the battery’s power.
  • For example, you could use half of your notebook’s charge in one day, and then recharge it fully. If you did the same thing the next day, it would count as one charge cycle, not two. In this way, it might take several days to complete a cycle.

It is actually the total number of charge and discharge of your phones battery. As described by the Apple website, ”A battery’s capacity diminishes in a “complete cycle.”

Charge and Discharge Cycles
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Meaning, with each complete cycle, the capacity of the battery is very slightly reduced, so we should avoid as many complete cycles as we can. Each lithium-based battery is capable of a finite number of charge-and-discharge cycles.

To avoid the complete cycles, try to keep your battery’s charge level not less than between 30 to 80 percent power. By doing this, you could increase the lifespan of your phones battery a little longer than usual.

Should You Charge or Leave Your Phone’s Battery Plugged in Overnight?

As I already told above, leaving your phone’s battery plugged in overnight won’t drastically harm your device. Smartphones are really smart theses days. With much better power optimizations and advanced software, today’s modern smartphones are now more capable in handling power consumption on the device than ever before.

Today’s modern smartphones automatically stop charging when the battery reaches its full capacity and begin using the connected charger as its primary power source, this way your phone remains fully charged when you wake up the next morning even when your phone remains powered on through the night.

However, the only thing which harms a Lithium-ion batteries is heat. Some Li-ion batteries don’t last as long in extreme temperatures, particularly in very hot climates.

This is the only area where NiMH batteries has advantage over Lithium-ion battery. Also, the Lithium-ion batteries are good for fast charging and get charged fast as it starts getting warmed.


As I told above, the only thing which harms a Lithium-ion battery the most is heat or overheat. To avoid the overheating try not to use fast charger every single time you charge your phone.

As you might already know that most of the today’s generation phones comes with fast charging support which makes the battery hot while charging the phone, which we now know is bad for your battery.

You can avoid getting excess heat on your phones battery by not using the fast charging option every single time which could also result in a longer lifespan for your phones battery. Lastly, I would like to say that, Leaving your phone plugged in for charging overnight dosn’t harm you smartphone.

Let me know if you have any questions or you can share your thoughts on charging the phones battery overnight in the comments section down below.