How to Make Phone Battery Last Longer

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Quick answer: To make your phone battery last longer each day, lower screen brightness or use auto-brightness, turn on dark mode, use Low Power Mode or Battery Saver, and limit apps that use location and background refresh. To make the battery itself last more years, avoid heat, keep the charge roughly between 20% and 80% when you can, and use your phone’s built-in charging protection (Optimized Charging on iPhone, Adaptive or Protect Battery features on Android). Apple says iPhone 15 and later batteries are designed to keep 80% of their original capacity after 1,000 full charge cycles.

Few things are more annoying than a phone that is on 15% by mid-afternoon. The good news is that most battery drain comes from a handful of settings, and modern iPhones and Android phones already have smart tools to protect the battery’s long-term health. You just need to switch them on.

This guide covers two different problems: getting through the day on one charge, and keeping your battery healthy so the phone still lasts a full day in two or three years’ time. The tips come from Apple, Google and Samsung’s own guidance.

In This Article

Why Does My Phone Battery Drain So Fast?

The usual suspects are a bright screen, weak mobile signal, apps using your location or refreshing in the background, and heat. Apple notes that poor coverage makes the phone work harder to search for a signal, and that apps using location services in the background can drain the battery noticeably. A new phone can also seem to drain fast for the first few days while it restores data and indexes photos.

To find the culprit, check the battery breakdown: on iPhone go to Settings > Battery, and on Android go to Settings > Battery (or Battery and device care on Samsung). Any app using far more than you would expect is worth restricting or uninstalling.

How Do I Make My Phone Battery Last Longer Every Day?

Turn down the brightness and turn on auto-brightness. The display is usually the single biggest drain.
Use dark mode. Google recommends a dark theme on Android. On phones with OLED screens, which includes most recent iPhones and flagship Android phones, dark pixels use less power.
Shorten the screen timeout to 30 seconds or a minute.
Turn on Low Power Mode (iPhone) or Battery Saver/Power saving (Android) when you know it will be a long day. Apple says Low Power Mode reduces display brightness, optimises device performance and minimises system animations.
Turn on Adaptive Battery on Android, which learns which apps you use least and limits them.
Review location access. Set apps to “While Using” rather than “Always”, and turn off location for apps that do not need it.
Limit background refresh. On iPhone, turn off Background App Refresh for apps that do not need it. On Android, restrict apps with high background use.
Cut unnecessary notifications. Every buzz wakes the screen and radio.
Use Wi-Fi when available. In areas with weak signal, Wi-Fi uses less power than searching for mobile data. Airplane mode helps when signal is very poor.
Turn off keyboard vibrations and sounds, which Google lists among battery savers.
Keep your software updated. Updates often include power optimisations.

How Do I Keep My Phone Battery Healthy for Longer?

All lithium-ion batteries age chemically. You cannot stop it, but you can slow it down.

Avoid heat above all. Apple says ambient temperatures above 95°F (35°C) can permanently damage battery capacity, and charging in the heat can damage it further. Do not leave your phone on a car dashboard or charge it under a pillow.
Do not worry too much about cold. Cold makes a battery seem to drain faster, but Apple says capacity returns to normal once the phone warms up.
Use built-in charge protection. On iPhone, Optimized Battery Charging learns your routine and holds the charge at 80% overnight, finishing just before you usually unplug. Newer iPhones also let you set a charging limit. Samsung’s Battery protection setting (Settings > Battery) can stop charging at a level you choose, such as 80%, and Pixel phones have Adaptive Charging.
Avoid running the battery to zero regularly. Shallow top-ups are fine. You do not need to “train” a modern battery with full discharges.
Use a good charger. Google advises using the charger that came with your phone or a reputable certified one.
Remove thick cases while fast charging if the phone gets noticeably hot.

Is It Bad to Charge Your Phone Overnight?

Not really, as long as you use your phone’s built-in protection. Modern phones stop charging at 100% and use features like Optimized or Adaptive Charging to avoid sitting at full charge for hours. The bigger risk overnight is heat, so charge on a hard surface rather than under bedding.

Should I Charge My Phone to 80%?

Keeping the battery between about 20% and 80% reduces stress on lithium-ion cells and can help them age more slowly. Phone makers have built this into their settings, so you do not need to unplug manually. If you need a full charge for a long day, charge to 100%. It is about habits over months, not individual days.

How Do I Check My Battery Health?

iPhone: Settings > Battery > Battery Health (on some models, Battery Health & Charging). Apple says batteries in iPhone 14 models and earlier are designed to keep 80% of their original capacity at 500 complete charge cycles, and iPhone 15 models and later at 1,000 cycles.
Samsung Galaxy: the Samsung Members app includes battery diagnostics.
Google Pixel: recent models show Battery health under Settings > Battery.

Once maximum capacity falls below about 80%, it is often worth paying for a battery replacement rather than buying a new phone. That is usually far cheaper and much better for the environment.

Frequently Asked Questions

Does turning off Wi-Fi and Bluetooth save battery?

Only a little on modern phones, which manage these radios efficiently. Turning them off helps most when you are in an area with no Wi-Fi and the phone keeps scanning.

Does closing apps save battery?

Generally no. Both Apple and Google design their systems to freeze background apps, and reopening a closed app from scratch can use more power. Restrict a specific app only if the battery screen shows it is misbehaving.

Does dark mode really save battery?

On OLED screens, yes, especially at higher brightness. On LCD screens, the saving is minimal.

Is fast charging bad for your battery?

Fast charging generates more heat, but phones manage it by slowing down as the battery fills. Occasional fast charging is fine. If you charge overnight, a slower charger is gentler.

How long should a phone battery last?

Typically two to four years of daily use before capacity drops noticeably, depending on the model, how many charge cycles it has gone through and how much heat it has been exposed to.

The Bottom Line

For better daily battery life, tackle the screen, location and background apps first, then use your phone’s power-saving mode on long days. For a battery that ages well, keep it cool and let your phone’s smart charging features do their job. And before you swap phones, make sure your photos and messages are safe with our guide on how to back up your computer and phone.

Sources

Apple — Batteries – Maximizing Performance.
Apple Support — iPhone battery and performance.
Google Android Help — Get the most life from your Android device’s battery.
Samsung US — Get the most out of your Galaxy phone or tablet battery.