Why shouldn’t you charge your iPhone all night?


When we go to sleep, most of us charge the smartphone next to the bed for the whole night. But why do we do it? An iPhone can go from zero to 50% charge in about 30 minutes, and then go to full charge in less than two hours. Given that an iPhone can charge so quickly, it doesn’t make sense that we plug it into a charger for an average of eight hours a day.

Apple offers an “optimized battery charging” feature in the operating system iOS 13 onwards. It is designed to reduce wear and tear on the battery and improve its lifespan by reducing the time it takes for the iPhone to fully charge. When the feature is enabled, the iPhone stops charging beyond 80% in certain situations. It uses machine learning on the device to learn your daily charging routine, so that “optimized battery charging” will only be activated when the iPhone is connected to the charger for an extended period of time, almost always while sleeping.

But even using this mode means that the iPhone stays connected to electricity all night. And it still charges, albeit at a slower rate – so it stays at 80 percent battery all the time.

So why shouldn’t you leave the phone connected to the charger for an extended period of time?

The answer is the heat, which destroys the battery. There is nothing to be done about the normal wear and tear that a battery goes through as a result of charging and discharging, but when the iPhone is connected to the charger it heats up more than when it is not connected.

Following these conclusions, the technological site wrote zdnet, Adrian Kingsley-Hughes decided to change the way he charges his iPhone. Instead of charging it at night, he charges it once or twice during the day.

He says he charges it for 30 to 45 minutes in the morning after he gets up (and then also charges his Apple Watch at the same time). Around the afternoon it charges for about another 30 minutes to bring it to the 80% mark, which will usually last until the next morning.

If Kingsley-Hughes knows he’s going to be out and about that day, he’ll use a car charger or portable charger. According to him this method works great for him, and he hopes that this way he is able to preserve more of his battery life. Thinking of trying too?

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