Start Here: Find the Actual Cause

Before adjusting settings at random, find out what's actually draining your battery. Both Android and iOS have a built-in battery usage breakdown:

  • iPhone: Settings → Battery → scroll down to see battery usage by app
  • Android: Settings → Battery → Battery Usage

Look for any app consuming a disproportionately large share of your battery, especially ones running in the background. Often, one or two apps are responsible for most of the drain.

Common Causes and How to Fix Them

1. Screen Brightness Too High

The display is one of the biggest battery consumers on any smartphone. Leaving brightness at maximum will noticeably reduce battery life.

Fix: Enable auto-brightness so your screen adjusts to ambient lighting automatically. On most phones, this is in Settings → Display → Adaptive/Auto Brightness. Manually reduce brightness when indoors.

2. Background App Refresh

Many apps continually refresh their content in the background, even when you're not using them. This is convenient but costly in terms of battery.

Fix:

  • iPhone: Settings → General → Background App Refresh → turn off for apps that don't need it (social media, news apps are common offenders)
  • Android: Settings → Apps → select an app → Battery → choose "Restricted" or "Optimised"

3. Location Services Running Constantly

GPS is one of the most power-hungry features on a phone. Apps that access your location continuously — even in the background — can drain a battery quickly.

Fix: Review which apps have "Always On" location access and change them to "While Using" or disable location entirely for apps that don't genuinely need it.

4. Push Email and Notifications

If your phone is constantly checking multiple email accounts for new messages, that's a steady trickle of battery use.

Fix: Switch from push (instant delivery) to fetch (check every 15–30 minutes) for email accounts that aren't time-sensitive. This is found in your email or mail app settings.

5. Weak Signal

When your phone has a weak cellular signal, it works much harder to maintain a connection — burning through battery faster. This is common in basements, rural areas, or older buildings.

Fix: If you're in an area with consistently poor signal, enable Airplane Mode and use Wi-Fi calling instead, or keep your phone on a charger when you know signal will be weak.

6. An Ageing Battery

Lithium-ion batteries degrade over time and hold less charge than when new. If your phone is more than 2–3 years old and battery life has noticeably declined, the battery itself may need replacing.

Check:

  • iPhone: Settings → Battery → Battery Health & Charging — if capacity is below 80%, consider a replacement
  • Android: Some manufacturers include a battery health indicator (Samsung: dial *#0228#); third-party apps like AccuBattery can also check this

Quick Wins: Settings to Change Right Now

  • Enable Low Power Mode (iPhone) or Battery Saver (Android) when battery is running low — these automatically reduce background activity
  • Turn off Wi-Fi, Bluetooth, and mobile data when you don't need them
  • Reduce or disable Always-On Display if your phone has one
  • Shorten your screen timeout so the display turns off sooner when idle
  • Keep your phone software up to date — updates often include battery optimisation improvements

When to Replace the Battery

If you've tried all the above and battery life is still poor, a battery replacement is often the most cost-effective fix — particularly for a phone you're otherwise happy with. Many phone manufacturers and third-party repair shops offer battery replacements at a fraction of the cost of a new device.