9 Feb 2026, Mon

Nowadays, most people leave their mobile phones charging before sleeping, so that the battery is 100 percent when they wake up in the morning. As easy as this habit sounds, it can prove dangerous for the smartphone’s battery and people’s safety. In fact, leaving the phone charging overnight not only reduces the life of the battery, but in some cases also increases the risk of incidents like overheating, fire or explosion. In such a situation, let us tell you today what harm it causes if you leave your mobile charging overnight.

There is constant pressure on the battery

Most of today’s smartphones use lithium ion or lithium polymer batteries. The charge cycle of these batteries is limited. Whereas when the phone gets 100 percent charged and then remains connected to the charge, the battery goes through the micro charge cycle. This has a direct impact on the health of the battery and within a few months the backup of the phone starts becoming weak.

Danger increases due to overheating

Leaving it on charging overnight generates heat in both the phone and the charger. If the mobile is kept under the pillow, in a blanket or on the bed, then the risk of overheating increases due to lack of ventilation. In many cases, this heat can cause short circuit, fire or phone explosion. Especially when local or cheap charger is being used.

Power fluctuation can also be the reason

It is common for electricity voltage to fluctuate at night. In such a situation, if the phone is on charging then power fluctuations can damage the charging port, battery or even the motherboard. The risk of damage increases due to not keeping an eye on it while sleeping.

The performance of the phone is also affected

When connected to charge for a long time, the charging circuit and processor of the phone remain active. This puts extra load on the system, the effect of which can also be seen on the performance of the phone. Many users have to face problems like phone slowing down, lagging or late opening of apps.

What is the right percentage to charge?

There is no need to charge the smartphone to 100 percent again and again. It is considered best to keep the battery between 20 to 80 percent. This puts less pressure on the battery and increases its lifespan. Many new smartphones also come with features like optimized or adaptive charging which stops charging up to 80 percent and gradually reaches 100 percent in the morning.

Be sure to take these precautions

  • Always use original or certified charger and cable while charging the smartphone.
  • Do not keep the phone under the pillow or blanket while charging.
  • If the phone is getting excessively hot, then immediately remove it from charging.
  • Instead of leaving the phone charging overnight, charge it during the day or evening.
  • To charge your smartphone, use a smart plug or timer which turns off the power as soon as the battery gets full.

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