Why does iPhone lose battery when left overnight?

iPhone battery drain overnight is a phenomenon in which your phone suddenly loses 5 - 10% of its battery even though you don't use it at all. In general, this is considered a fairly common and frequently recurring problem among iPhone users for a long time. You must be wondering what happened to your iPhone while you were sleeping?

Reasons why iPhone battery drops when left overnight

Reasons why iPhone battery drains when left overnight

The situation of iPhone battery dropping overnight also occurs due to the following reasons:

iPhone's battery is dead

If you've been using your iPhone for a long time or don't pay attention to battery usage, you may encounter a situation where your iPhone's battery is completely drained overnight. This is a sign that your iPhone battery is worn out and needs to be handled promptly. Some of the main causes of iPhone battery failure are:

1. Charge iPhone while still using the phone.
2. Overcharge your iPhone and leave it overnight continuously.
3. Using iPhone too much without resting.
4. Wait for the iPhone to completely run out of battery before charging it again.
5. Using non-genuine or inappropriate iPhone batteries.

Utility services have not been turned off

One of the reasons why an iPhone runs out of battery overnight is because you don't turn off utility services. These services will enable applications to run in the background and consume a lot of battery. Some utility services that often cause battery drain when iPhone is not in use are: WiFi Network, Mobile Network, Bluetooth, Location, AirDrop.

Leave many applications running in the background

The error of leaving your iPhone's battery drained overnight is because you don't turn off applications running in the background. These applications continuously use WiFi/4G to send and receive data, consuming a lot of battery. For example, Facebook, Zalo, Messenger,. are applications that often operate in the background and take up a lot of energy.

iPhone battery drain can be caused by many applications running in the background.

iOS software error

An iPhone left overnight with a completely drained battery may have a software conflict that is common on iOS operating system versions. In addition, the applications on your iPhone also conflict, which also affects the device's battery power.

Screen brightness is too bright

One of the conditions that causes an iPhone to run out of battery overnight is because you leave the screen brightness too high. Screen brightness that is too bright will increase the device's power consumption, even if you don't use it. Not only that, too bright a screen also causes eye discomfort, reduces vision and affects health.

How to fix iPhone battery drain overnight?

Below are the most effective and easy ways to fix the problem of iPhone battery draining overnight when left on overnight:

Turn off Wi-Fi and Cellular Data Connection

Even when not in use, network connections are still active in the background and constantly trying to connect so that the iPhone has the best signal strength. This is considered a major cause of battery drain. Therefore, to avoid battery drain on your iPhone, it is essential that you turn off Wi-Fi and Cellular Data before going to bed.

Turn off Bluetooth

Another reason why your iPhone battery drains quickly overnight is because Bluetooth is always on. Bluetooth continuously searches for nearby devices for quick connection. So it reduces the battery life of your iPhone.

Turn on Airplane mode

'Airplane mode' will turn off all wireless connections on your iPhone. So you don't need to turn off Wi-Fi or Bluetooth individually. In addition, this mode also helps your iPhone save significant energy and prolong battery life.

Adjust screen brightness settings for iPhone

By default, the Auto-Brightness feature will be turned on so that iPhone automatically adjusts the screen brightness depending on the surrounding brightness. However, if you set the screen brightness to high, your iPhone will have to consume a lot of battery to keep the screen at the brightness according to your settings. So, adjust your screen brightness settings to the lowest and most comfortable level to optimize battery performance on your iPhone.

Use Night Shift mode

This feature, when activated, will automatically change the color of the iPhone screen, eliminating blue light at specific hours of the day, including at night. Thereby saving a lot of battery life for your iPhone.

Enable 'Low Power Mode' feature

If you don't like turning off your iPhone at night, consider turning on Low Power mode. When enabled, it will automatically limit background activities and disable battery-hungry apps to optimize device battery life.

Turn off Background App Refresh

The Background App Refresh feature, when enabled, will automatically continuously update application content on iPhone every time the device connects to Wi-Fi or Mobile Data. Although this is a great feature, it is also considered one of the main reasons why your iPhone battery drains. Therefore, I recommend that you turn this feature off.

Turn off Positioning

Location Services helps iPhone users enhance their overall experience. However, there is a significant drawback: this feature consumes a significant amount of battery. So if you enable it and leave it running overnight, your iPhone will consume a lot of battery.

By turning off Location Services on your iPhone, you can extend the overall life of your battery and prevent any future location problems. However, if you use a lot of location-based apps, you should consider disabling this option or just turn it off when you go to sleep.

Delete unused applications

The most common reason why iPhone battery drains quickly when left overnight may be due to unnecessary or rarely used applications on your device. Therefore, if necessary, remove these applications from your iPhone.

Basically, mobile applications tend to consume power even when you are not using them and continuously affect battery life. However, if you don't know which apps might be causing the most impact on your device, you can check them accurately from 'Screen Time' in Settings.

Please update the app and new iOS version if available

If any app encounters a major error, it can drain your iPhone's battery quickly. To resolve the issue, publishers often release updates to their apps. Therefore, make sure all the applications on your device are updated.

Reset iPhone

The last but not least solution is to reset your iPhone when the above solutions do not bring the expected results. Basically, when you implement this solution, any software-related problems affecting battery performance will be thoroughly fixed.

Above are the most common and effective ways to fix iPhone battery drain overnight. Please refer to and fix this situation on your iPhone so that your experience is not interrupted.

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