How to Make Your Phone Battery Last Longer (and What Doesn’t Help)
The settings that genuinely extend battery life on Android and iPhone, plus the popular battery myths you can safely ignore.
Battery life is one of the most common phone complaints, and one of the most surrounded by myths. Some habits make a real difference; others only feel productive. This guide covers the settings worth changing on Android and iPhone, explains why phones drain faster in certain situations, and sorts out which popular tips you can stop worrying about.
Start by finding out what is using the battery
Before changing anything, check where the power is going. A single misbehaving app can drain more than every other setting combined, and your phone can tell you which one it is.
On Android
Open Settings and search for “Battery usage”. You’ll see which apps and system components used the most power recently, such as since the last full charge or over the past day. Samsung and some other brands place this under “Battery and device care” or a similar menu.
On iPhone
Open Settings and tap Battery. Charts show your recent battery level and usage, with a list of the apps that used the most battery below them. The layout changes a little between iOS versions, but the app list is always the part to check.
If an app you barely open sits near the top of the list, update it first. If it keeps draining power, limit its background activity (covered below) or uninstall it.
The settings that make the biggest difference
Let brightness adjust automatically
The screen is usually one of the biggest users of power. On Android, search Settings for “Adaptive brightness”. On iPhone, “Auto-Brightness” is under Settings, Accessibility, Display & Text Size. Both lower the brightness when you don’t need it.
Shorten the screen timeout
A screen that stays on after you put the phone down wastes power. On Android, search Settings for “Screen timeout”. On iPhone, go to Settings, Display & Brightness, Auto-Lock. A short setting such as 30 seconds or 1 minute suits most people.
Use dark mode if your phone has an OLED screen
On OLED displays, which many phones use, dark pixels use less power than bright ones. Dark mode helps most when you use the phone at high brightness. On LCD screens the saving is minimal.
Turn on power saving when you need it
Android’s “Battery Saver” (called “Power saving” on some brands) and iPhone’s “Low Power Mode” reduce background activity and some visual effects. Switch them on when you know you’ll be away from a charger for a while.
Review which apps use your location
Apps that can use your location all the time may wake the phone often. On Android, search Settings for “App location permissions”. On iPhone, go to Settings, Privacy & Security, Location Services. For apps that don’t need constant location, choose the option that allows it only while you’re using the app, or turn it off.
Android: limit background activity
Android lets you control what individual apps do when you’re not using them. Open Settings, go to Apps, pick an app, and look for “Battery” or “App battery usage”. On many phones you can choose between Unrestricted, Optimized and Restricted. Optimized is the sensible default; Restricted stops most background activity but can delay that app’s notifications.
Many Android phones also have “Adaptive Battery”, which learns which apps you use and limits the rest. Samsung phones offer similar controls, such as lists of sleeping apps, in their battery settings. Menu names differ by brand, so searching Settings for “battery” is the quickest route.
iPhone: limit background activity
On iPhone, go to Settings, General, Background App Refresh. You can turn it off completely, allow it only on Wi-Fi, or switch it off for individual apps. Apps you rarely use don’t need to refresh in the background. Turning it off for an app doesn’t block its regular notifications; the app simply fetches new content when you open it.
It’s also worth checking Settings, Battery, Battery Health (called Battery Health & Charging on some models). If the maximum capacity has dropped a lot, or the screen says performance management has been applied, a battery replacement may help more than any setting.
Why your battery drains faster in some places
- Weak mobile signal: When reception is poor, the phone works harder to stay connected. In buildings with bad signal, connecting to Wi-Fi usually helps.
- Patchy 5G coverage: Where 5G signal comes and goes, some phones use extra power switching between networks. Many phones have an automatic 5G mode; on iPhone it’s “5G Auto” under Cellular (or Mobile Data) settings, in the Voice & Data options. If battery life matters more than speed, you can choose 4G or LTE instead.
- Heat and cold: Batteries work best at moderate temperatures. In very cold weather the battery level can drop quickly for a while, and heat both drains the battery and ages it faster.
- Heavy tasks: Navigation with the screen on, video calls and gaming are demanding on any phone. On days you’ll rely on them, carry a charger or power bank.
What doesn’t help (or makes things worse)
| Common tip | What actually happens |
|---|---|
| Swiping away all your open apps | Android and iOS pause background apps on their own. Reopening an app from scratch can use more power than resuming it. Close an app only if it’s frozen or misbehaving. |
| Installing a battery saver or task killer app | These apps often run in the background themselves, show ads, and repeat what the built-in power saving mode already does. |
| Draining the battery to 0% before charging | Modern lithium-ion batteries don’t need to be fully drained. Regular deep discharges are harder on them than frequent top-ups. |
| Keeping Wi-Fi and Bluetooth off all the time | When idle, they use relatively little power. Turning off Wi-Fi can even cost battery if the phone falls back to a weak mobile data signal. |
| Never charging overnight | Phones stop charging when full, and optimized or adaptive charging features reduce time spent at 100%. Keeping the phone cool matters more. |
Charging habits that protect the battery over time
- Keep it cool: Avoid charging under a pillow, in direct sun or in a hot car. If the phone gets very hot while charging, take off the case and let it cool.
- Turn on charging protection: iPhone has “Optimized Battery Charging” under Settings, Battery, and some models also offer a charging limit. Many Android phones have similar features, such as “Adaptive Charging” on Pixel phones and battery protection options on Samsung phones.
- Use a good-quality charger and cable: Chargers from your phone’s maker or reputable, certified brands are safer than very cheap, unbranded ones.
Does dark mode really save battery?
On phones with OLED screens it can, especially at higher brightness, because dark pixels use less power. On phones with LCD screens the difference is very small. Use it if you like it, but it won’t fix a serious drain on its own.
Is it bad to use my phone while it charges?
Generally no. It will charge more slowly, and heavy tasks like gaming can make it warm. If the phone gets hot, take a break or remove the case.
Is fast charging bad for the battery?
Fast charging is built into modern phones and is designed to be safe with a compatible charger. The phone controls the charging speed and slows down as the battery fills. Heat is the main thing to watch.
When should I replace the battery?
Consider it when the battery no longer gets you through a normal day even after trying the tips above, or when the battery health screen reports reduced capacity or performance management. Use the manufacturer or an authorized repair service.