If you’ve owned an iPhone for a while, you’ve probably noticed at some point that the battery just isn’t what it used to be. A battery that easily lasted all day when the phone was new starts draining faster and faster over time, and eventually you might find yourself never far from a charger. Most of this comes down to a combination of the battery’s natural chemical aging and everyday usage habits — but following a handful of principles can meaningfully extend how long your battery stays healthy.

The most fundamental factor is charging habits. Lithium-ion batteries experience far less chemical stress over the long run when kept between roughly 20% and 80% charge, compared to fully draining them and then charging all the way to 100%. This is exactly why Apple built Optimized Battery Charging into the iPhone by default. The feature learns your charging patterns, so even if you leave your phone plugged in overnight, it holds the charge around 80% until closer to when you’ll actually need it, then tops off the rest right before you wake up. Simply checking that this setting is enabled can make a real difference in long-term battery health.

Temperature management also has a decisive effect on battery lifespan. Lithium-ion batteries are especially vulnerable to heat — leaving your iPhone in a hot car in summer or using it for extended periods in direct sunlight is one of the fastest ways to age the battery cells. Cold environments can cause temporary performance dips too, but permanent damage happens far more readily in high-heat conditions. Fast charging while a case is still on can trap extra heat, so it helps to remove the case while charging, or at least charge in a well-ventilated spot.

Screen brightness and refresh rate also have a major impact on battery drain. The display accounts for a large share of an iPhone’s total power consumption, so simply enabling auto-brightness and avoiding unnecessarily high brightness levels can meaningfully extend your daily usage time. On models with ProMotion, adjusting the refresh rate settings to match your actual needs helps too, and turning off the always-on display if you don’t rely on it is another effective way to save battery.

Background apps quietly drain more battery than most people realize. Under Settings > Battery, you can see exactly how much battery your recently used apps have consumed — and if you spot an app using more than expected, turning off Background App Refresh for it is a good move. Apps that constantly track location or send frequent push notifications tend to be the biggest offenders.

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Network connectivity is another factor worth paying attention to. In areas with weak signal, your iPhone has to work harder — and use more power — to maintain a connection, so spending a lot of time in low-signal areas noticeably speeds up battery drain. Prioritizing Wi-Fi over cellular data when available uses less power, and it’s a small habit, but not leaving Bluetooth or Wi-Fi running unnecessarily when you don’t need them adds up over time too.

Checking your battery health regularly is also worth building into your routine. Under Settings > Battery Health, you can see your battery’s current maximum capacity as a percentage. Once that number drops below 80%, you’ll likely start noticing the battery draining faster even during normal use. At that point, it’s reasonable to consider a battery replacement — swapping it out at the right time, rather than pushing an aging battery for too long, keeps the overall experience far more comfortable.

Ultimately, there’s no secret trick to keeping an iPhone battery healthy for the long haul — it comes down to consistently paying attention to a handful of basics: charging habits, temperature management, display settings, background app management, and network usage habits. None of these will make a dramatic difference overnight, but stacked up over months and years, these small habits add up to getting far more comfortable, long-lasting use out of the same device.