How do I improve my phone's battery life?

Battery advice tends to be a list of every possible setting, most of which make no measurable difference. The screen is almost always the largest single consumer, followed by a small number of apps doing work in the background. Both are visible in the battery usage screen, which is where any real diagnosis starts.

Step by step

1. Open the battery usage screen and look at what's actually consuming power.iPhone: Settings → Battery. Android: Settings → Battery → Usage. This turns guesswork into diagnosis.
2. Reduce screen brightness and shorten the auto-lock timeout.The display is usually the single largest consumer. Auto-brightness plus a 30-second timeout makes a real difference.
3. Restrict background activity for apps you don't need updating constantly.Social, news, shopping and delivery apps are the usual culprits. You'll still get notifications.
4. Turn off location access for apps that don't need it, or set it to 'while using'.Continuous background location is one of the heavier drains and is rarely necessary.
5. Check battery health.iPhone: Settings → Battery → Battery Health. Android varies by manufacturer. Below about 80%, the battery is the problem.
6. Turn on low power or battery saver mode when you need to stretch a charge.It reduces background refresh and some visual effects. Effective when you need it, not something to run permanently.
7. Use dark mode if your phone has an OLED screen.OLED pixels are individually lit, so dark backgrounds genuinely use less power. On LCD screens it makes almost no difference.
8. Keep the phone out of extreme heat.Heat permanently degrades battery capacity. Leaving a phone on a car dashboard in summer does lasting damage.
9. If health is low, replace the battery rather than the phone.It's a fraction of the cost and often restores the phone to as-new endurance.

Tips

• Charging habits matter less than they used to — modern phones manage charging themselves, including optimised overnight charging. Avoiding extreme heat matters more.
• A phone that suddenly loses battery life after an update usually settles within a few days as background indexing completes.
• Battery percentage isn't linear in perceived terms — the last 20% often drains faster because background tasks and screen brightness haven't changed.
• 5G uses more power than 4G in areas with weak coverage, because the phone works harder to hold a signal.

Common mistakes

• Force-closing apps to save battery — On both iOS and Android, relaunching an app from cold uses more power than leaving it suspended.
• Ignoring battery health — Below about 80%, no setting compensates. The battery is a consumable.
• Leaving the phone in hot places — Heat causes permanent capacity loss, unlike most other factors.
• Changing settings without checking usage first — You may be optimising something that uses 2% while ignoring what uses 40%.

Questions people ask