How to prolong an iPhone battery's life
If you want to know how to prolong iPhone battery life, you’re not alone. An iPhone’s battery will die eventually. Over time, it will retain less and less charge until it only lasts a few hours. There isn’t much you can do about this since that’s how batteries work, but understanding the right settings can make a real difference. Modern iPhones include a feature called Optimized Battery Charging specifically designed to help preserve battery health over the long term. Here’s how it works and how to get the most out of it.
How to prolong iPhone battery life with Optimized Charging
Open the Settings app on your iPhone and tap Battery. On the Battery screen, tap Battery Health & Charging — on some iPhone models or iOS versions this may appear simply as Battery Health, so the exact label can vary. Look for the switch called Optimized Battery Charging and turn it on. Once enabled, iOS manages charging automatically based on your daily habits, so there is no ongoing effort required.
Enabling this setting is one of the simplest and most effective steps you can take when learning how to prolong iPhone battery life. It requires no ongoing effort — once it’s switched on, iOS manages the rest automatically based on your daily habits.
How Optimized Battery Charging works
Before diving in, it helps to understand a key distinction Apple makes between two related but different concepts:
- Battery life refers to how long your iPhone lasts on a single charge — the hours you get between plugging in.
- Battery health (or battery lifespan) refers to how well the battery retains its original capacity over months and years of use.
Optimized Battery Charging is primarily a battery health feature. It will not noticeably extend today’s runtime, but it helps slow the gradual decline in capacity that happens over time — meaning your iPhone should hold a useful charge for more charge cycles before needing a battery replacement.
The feature works by limiting how long your iPhone stays charged to 100%. When you connect your iPhone to a power source, it may hold the charge at 80% and delay completing the charge based on your routine. If iOS detects you typically unplug early in the morning, it will finish charging to 100% just before you need it.
In contrast, when you plug in at your desk for a long stretch, iOS will hold the charge at 80% for most of that time and only top up to 100% near the end of the session — for example, around the time you usually leave work.
If you were to turn this feature off, your iPhone would charge to 100% quickly and remain there until you unplug. According to Apple, spending extended time at full charge accelerates battery degradation over time, which gradually reduces how much charge the battery can hold — this is a battery health concern rather than something you will notice on any given day. Other factors can affect battery performance too, including battery drain caused by VPN apps running in the background.
Day-to-day settings to extend iPhone battery life
Optimized Battery Charging protects long-term battery health, but there are several settings you can adjust right now to get more hours out of each charge. Here is a step-by-step rundown:
- Enable Low Power Mode: Go to Settings > Battery and turn on Low Power Mode. This reduces background activity, visual effects, and automatic downloads to stretch your remaining charge further. You can also add it to Control Center for quick one-tap access.
- Lower screen brightness or enable Auto-Brightness: The display is one of the biggest battery drains on any iPhone. Reduce brightness manually in Control Center, or go to Settings > Accessibility > Display & Text Size and turn on Auto-Brightness so the screen adjusts automatically to your environment.
- Prefer Wi-Fi over cellular: Cellular radios consume significantly more power than Wi-Fi. Whenever possible, connect to a trusted Wi-Fi network to reduce the load on your battery.
- Turn off Background App Refresh for nonessential apps: Go to Settings > General > Background App Refresh and disable it for apps that do not need to update in the background. Social media and news apps are common culprits.
- Reduce Location Services access: Go to Settings > Privacy & Security > Location Services. For apps that do not genuinely need your location, change their permission to Never or While Using the App to prevent constant background location checks.
- Cut down on notification-heavy apps: Every notification that lights up your screen costs battery. Go to Settings > Notifications and disable alerts for apps you do not need to hear from immediately.
- Keep iOS updated: Apple regularly includes battery performance improvements in software updates, so keeping your iPhone on the latest available iOS version is a straightforward win.
- Avoid extreme temperatures: iPhones operate best between 0° and 35°C (32° to 95°F). Exposure to high heat in particular can permanently damage battery capacity over time.
Check Battery Usage to find what’s draining your iPhone
If your battery is draining faster than expected, the most useful first step is to find out exactly what is causing it rather than guessing. Go to Settings > Battery and scroll down to see battery usage broken down by app over the last 24 hours and the last 10 days.
Tap Show Activity to see both on-screen and background usage for each app. Here is what the common labels mean and what to do about them:
- Background Activity: The app is consuming power even when you are not actively using it. Go to Settings > General > Background App Refresh and turn it off for that app. If the culprit is a mail app, go to Settings > Mail > Accounts > Fetch New Data and switch from Push to Fetch, or set it to Manual so the app only checks for new mail when you open it.
- Background Location or Location: The app is accessing your GPS in the background. Go to Settings > Privacy & Security > Location Services, find the app, and change its permission to While Using the App or Never.
- Home & Lock Screen: Notifications are waking your display frequently. Go to Settings > Notifications, find the app, and reduce or disable its alerts to stop unnecessary screen wake-ups.
- No Cell Coverage or Low Signal: Your iPhone is working harder to maintain a cellular connection in a weak signal area, which drains the battery quickly. In areas with consistently poor reception, switch to Airplane Mode and rely on Wi-Fi, or enable Wi-Fi Calling in Settings > Phone > Wi-Fi Calling so calls route over your network connection instead.
Reviewing battery usage regularly is one of the most practical ways to pinpoint and fix the specific cause of drain on your device, rather than applying every setting change and hoping for the best.
Tips to prolong iPhone battery life on older iPhones
Optimized Battery Charging is available on all iPhones running a supported version of iOS, but the benefits shrink as a battery ages. Older models have already experienced some degree of battery wear, so software settings alone may not be enough to meaningfully improve runtime.
The clearest way to assess your battery’s condition is through the Battery Health screen. Go to Settings > Battery > Battery Health & Charging (or Battery Health, depending on your iOS version). Here is what to look for:
- Maximum Capacity: This percentage shows how much charge your battery can hold compared to when it was new. A brand-new battery sits at 100%. As it ages through charge cycles, this number drops. Once it falls below 80%, you will notice a significant reduction in how long your iPhone lasts on a single charge. Apple considers this the practical threshold for battery replacement.
- Performance capability and service warnings: If your iPhone displays a message saying the battery has significantly degraded, or that it cannot be verified as a genuine Apple battery, replacement is likely the most effective fix available. At this point, even enabling every power-saving setting in this guide may not prevent your phone from dying early in the day.
- Performance throttling: An aging battery that can no longer deliver peak power may trigger iOS to limit your iPhone’s processor speed under heavy load. This means a worn battery can cause both shorter runtime and a sluggish experience during demanding tasks like gaming, video editing, or heavy multitasking. A battery replacement resolves both problems at once, since the underlying cause is the same.
If your Maximum Capacity is below 80% or you are seeing a service warning, the software tips in this guide are unlikely to be enough on their own. Apple offers a battery replacement service through the Apple Store and authorized repair providers, which can restore your iPhone to near-original battery capacity. This is worth the investment if your device is otherwise in good condition and you plan to keep using it.
For older iPhones still above 80% capacity, all of the settings changes covered above — Low Power Mode, Background App Refresh, Location Services, and reducing screen brightness — remain worthwhile and can extend daily runtime while you get more life out of your current battery. Taking proactive steps, whether through software settings or hardware servicing, remains the best approach to how to prolong iPhone battery life regardless of your device’s age.
