Phone batteries degrade over time, but even on a relatively new phone, there's a good chance your battery life is shorter than it could be. The biggest drains on battery life are almost always software and settings issues — not hardware — which means they're fixable without spending any money. Here's what actually makes a difference.
The biggest battery drains (and how to fix them)
Before diving into specific tips, it's useful to understand where your battery actually goes. For most people, the display accounts for 30-50% of battery usage, followed by background app activity, location services, and push notifications. Targeting these areas gives you the biggest gains.
1. Turn on Low Power / Battery Saver mode earlier
Most people treat Low Power Mode (iPhone) or Battery Saver (Android) as an emergency measure for when they're almost out of battery. But enabling it at 50% instead of 20% can meaningfully extend how long you make it through the day. Both modes reduce background refresh, lower screen brightness, and disable some visual effects — things you rarely notice but that drain battery constantly. On iPhone: Settings → Battery → Low Power Mode. On Android: Settings → Battery → Battery Saver. You can set Android to automatically enable it at a threshold you choose.
2. Reduce screen brightness and enable auto-brightness
The display is your biggest single power consumer. Running at full brightness all day is unnecessarily wasteful — most indoor environments are comfortable at 40-60% brightness. Enable auto-brightness and let your phone adjust based on ambient light: on iPhone, it's Settings → Accessibility → Display & Text Size → Auto-Brightness. On Android it's usually Settings → Display → Adaptive Brightness. Additionally, if your phone has an OLED screen (most flagship and many mid-range phones since 2020), using a dark theme genuinely saves battery — OLED pixels that display black are literally turned off, consuming no power.
3. Audit your location services
Location services are one of the sneakiest battery drains. Many apps request "Always On" location access when they only need it "While Using" — meaning they're quietly tracking your location in the background all day, every day. Go through your location settings and be aggressive: most apps should be set to "While Using App" or "Never". Weather apps, maps, and ride-sharing apps legitimately need location. Social media apps, shopping apps, and games rarely do. On iPhone: Settings → Privacy & Security → Location Services. On Android: Settings → Location → App Permissions.
4. Turn off Background App Refresh for apps that don't need it
Background App Refresh allows apps to silently check for new content even when you're not using them — your email app fetching new messages, your news app pulling headlines, social apps checking for notifications. This is useful for apps you check frequently, but most apps don't need it. On iPhone: Settings → General → Background App Refresh. Turn it off entirely or selectively disable it for apps where you don't need instant updates. On Android this is managed through individual app settings or battery optimisation settings.
5. Check which apps are actually consuming your battery
Both iOS and Android show you exactly which apps have used the most battery. Check this before making any changes — you might find one app is responsible for 40% of your battery drain, and deleting or restricting just that one app solves most of your problem. On iPhone: Settings → Battery → scroll down to see battery usage by app over the last 24 hours or 10 days. On Android: Settings → Battery → Battery Usage. Look for social media apps (Facebook, Instagram, TikTok) and messaging apps (WhatsApp) — these are consistently the worst offenders.
6. Disable push email for less important accounts
Push email means your phone is constantly maintaining a connection to check for new messages in real time. For your main work or personal account this makes sense. For secondary accounts, newsletters, or promotional email addresses, switch to Fetch instead — your phone checks for new mail every 15 or 30 minutes rather than constantly. On iPhone: Settings → Mail → Accounts → Fetch New Data.
7. Keep your phone at moderate temperatures
Battery chemistry is significantly affected by temperature. Charging your phone while it's very hot (like in direct sunlight or under a pillow) or using it in very cold conditions both accelerate battery degradation over time. The ideal charging temperature range is roughly 0°C to 35°C. For a phone you plan to keep for several years, being mindful of this genuinely extends long-term battery health.
8. Avoid charging to 100% and draining to 0%
Modern lithium batteries are healthiest when kept between 20% and 80% charge. Regularly charging to 100% and running down to 0% causes measurable long-term capacity loss. Both iPhone (Settings → Battery → Battery Health & Charging → Optimized Battery Charging) and most Android phones now have features to manage this automatically. Enable them if they're not already on. This doesn't affect day-to-day battery life but meaningfully extends how long your battery remains healthy over years of use.
What if none of this helps?
If you've implemented all of the above and your battery still dies by mid-afternoon, your battery may have genuinely degraded. Check your battery health: on iPhone, Settings → Battery → Battery Health & Charging shows a percentage — anything below 80% means your battery is significantly degraded and replacement is worth considering. Battery replacements are surprisingly affordable ($50-$80 at Apple or most repair shops) and can make an old phone feel new again.