The most common reasons your iPhone battery dies quickly

Your iPhone battery drains fast because of one or more of these things: apps running in the background, screen brightness set too high, location services tracking constantly, or a battery that has lost capacity over time. The culprit is rarely a single setting — it is usually a combination. The good news is that most of these are things you can control right now.

iPhones also drain faster in cold weather, on weak cellular signals (your phone works harder to find a connection), and when you have too many notifications coming in. If your phone is more than three or four years old, the battery itself may have degraded enough that it no longer holds a full charge, even with perfect settings.

Key Takeaways

  • Background app refresh, location services, and high screen brightness are the three biggest battery drains you can control when ready.
  • Check Settings > Battery to see which apps are using the most power — the list shows you what is actually running, not what you think is running.
  • Turning on Low Power Mode cuts battery drain by roughly 20 to 30 percent by limiting background activity and reducing performance slightly.
  • If your iPhone is three years old or older and drains to zero within a few hours of normal use, the battery itself has likely degraded and may need replacement.
  • Cold weather, weak signal, and too many notifications all force your phone to work harder and drain the battery faster.

How to check which apps are draining your battery

Open Settings, tap Battery, then tap Battery Usage. You will see a list of apps ranked by how much power they have used in the last 24 hours or the last 10 days — toggle between the two at the top. The apps at the top are the ones pulling the most energy.

The list shows you what is actually happening, not what you assume is happening. Many people are shocked to find that an app they barely use is in the top three. If an app you do not use often is near the top, you can delete it or turn off its background refresh. Tap the app name to see options for limiting what it can do in the background.

Turn off background app refresh for apps you do not need running constantly

Background app refresh lets apps update their content even when you are not using them. This is useful for Mail, Messages, and Weather, but not for games, news readers, or social media apps that you check manually. Open Settings, tap General, then Background App Refresh. You will see a toggle for each app. Turn off the ones you do not need to update in the background.

Turning this off for five or six apps can add two to four hours to your battery life, depending on how often those apps were refreshing. Start with the apps at the top of your Battery Usage list — if an app is draining power and you do not need it running in the background, this is the fastest fix.

Reduce screen brightness and turn on auto-brightness

Your screen is usually the single biggest battery drain. If you keep brightness at 80 percent or higher, lowering it to 40 to 50 percent can add three to five hours to your battery life. Open Settings, tap Display & Brightness, and drag the brightness slider down. You can also turn on Auto-Brightness so your phone adjusts brightness based on the light around you.

If you use your phone outdoors a lot, auto-brightness will keep the screen bright in sunlight but dim it indoors, which saves power. Many people leave brightness at maximum out of habit, not because they need it that high. Lowering it is one of the fastest ways to extend battery life without changing how you use your phone.

Turn off location services for apps that do not need it

Location services use your phone's GPS, which is power-hungry. Open Settings, tap Privacy & Security, then Location Services. You will see a list of apps with permission to use your location. For most apps — games, shopping apps, news readers — you can turn this off entirely. Maps and Weather need it. Navigation apps need it. Most other apps do not.

Tap each app and change the setting from "Always" or "While Using" to "Never". If an app stops working without location access, you can turn it back on. Many apps ask for location permission but rarely use it, so turning it off costs you nothing and saves battery power throughout the day.

Enable Low Power Mode to cut battery drain by 20 to 30 percent

Low Power Mode is a built-in setting that reduces performance and limits background activity to stretch your battery. Open Settings, tap Battery, then tap Low Power Mode and turn it on. Your phone will run slightly slower — apps may take a moment longer to open, and some features like automatic downloads will pause — but you will get significantly more time before the battery dies.

You can turn Low Power Mode on and off as needed. Many people turn it on when the battery hits 30 percent, but you can turn it on anytime. If you find yourself running out of battery every day, turning on Low Power Mode by default (or at 50 percent) can be the difference between making it through the day and needing to charge at work.

Check if your battery has degraded and needs replacement

iPhones batteries degrade over time. After 500 full charge cycles (roughly two to three years of normal use), a battery typically holds 80 percent of its original capacity. After three to four years, it may hold only 70 to 75 percent. Open Settings, tap Battery, then Battery Health & Charging. Look at the Maximum Capacity number — if it is below 80 percent, your battery has degraded.

If your Maximum Capacity is below 80 percent and your phone dies within a few hours of normal use, Apple or an authorized repair shop can replace the battery. The cost varies by iPhone model but is usually between $50 and $100. A new battery will restore your phone to nearly full battery life, often adding four to six hours to your daily use.

Other settings and habits that drain battery faster

Notifications drain battery because each one lights up your screen and wakes your phone. If you have dozens of apps sending notifications, turn off notifications for apps you do not need alerts from. Open Settings, tap Notifications, and disable notifications for apps like games, shopping apps, and news readers.

Weak cellular signal also drains battery because your phone works harder to find and maintain a connection. If you are in an area with poor signal, your battery will drain faster than in a place with strong signal — this is not something you can fix, but it explains why your battery drains faster in certain locations. Cold weather has the same effect: batteries work less efficiently in cold, so your phone drains faster and may even shut down temporarily even though the battery is not actually empty.

Frequently Asked Questions

Why does my iPhone battery drain faster in winter?

Cold temperatures reduce how efficiently batteries work. Your iPhone may drain 20 to 30 percent faster in cold weather, and the battery percentage may drop suddenly or the phone may shut down even though the battery is not actually empty. Keeping your phone warm — in a pocket or bag — helps. The battery recovers its normal performance when the phone warms up.

Does leaving Wi-Fi on drain battery faster than using cellular?

No. Wi-Fi uses less power than cellular, so leaving Wi-Fi on actually saves battery. The drain comes from searching for Wi-Fi networks when you are not connected. If you are in an area with poor cellular signal, turning on Wi-Fi and connecting to a network will extend your battery life.

Should I close apps running in the background to save battery?

Closing apps manually does not save much battery. iOS manages background apps efficiently, and closing them does not stop them from using power when you open them again. The better approach is to turn off background app refresh for apps you do not need running constantly, which prevents them from using power in the first place.

Can I replace my iPhone battery myself?

Apple and authorized repair shops can replace your battery. Replacing it yourself is not recommended because the battery is glued in and removing it risks damaging the phone. Apple charges between $50 and $100 depending on your iPhone model, and the replacement usually takes a few hours.

Does using dark mode save battery on all iPhones?

Dark mode saves battery only on iPhones with OLED screens (iPhone 12 and newer). On older iPhones with LCD screens, dark mode makes no difference to battery life. If you have an iPhone 12 or newer, turning on dark mode can add one to two hours to your battery life.