Charge and maintain your iPhone battery

Learn how charging and using your iPhone in ideal conditions can prolong your battery's lifespan.

About your battery's lifespan

A battery’s lifespan is related to its chemical age, which is more than just the length of time since the battery was assembled. A battery’s chemical age results from a complex combination of several factors, including temperature history and charging pattern. All rechargeable batteries are consumable components that become less effective as they chemically age. As lithium-ion batteries chemically age, the amount of charge they can hold diminishes, resulting in reduced battery life and reduced peak performance. The one-year warranty includes service coverage for the battery in addition to rights provided under local consumer laws.

Learn about iPhone charge cycles

Learn more about iPhone battery and performance

How charging affects your battery

For most customers, the battery in your iPhone should last the whole day. You can charge your iPhone every night even if the battery isn't fully depleted.

iPhone automatically stops charging when the battery is fully charged, so it's safe to keep your iPhone connected to a charger overnight. Charging resumes automatically if your battery level drops below 95 percent.

When possible, unplug your iPhone after it has fully charged. By default, your iPhone uses Optimized Battery Charging. To improve your battery's lifespan, Optimized Battery Charging reduces the time that your iPhone spends fully charged. It fully charges your iPhone just in time for you to use it.

A battery warms up as it charges, which can reduce its lifespan. To reduce the effect of heat and prevent overheating, iPhone gradually reduces the charging current as the battery approaches full charge.

Learn more about charging optimizations

How temperature affects your battery

iPhone is designed to perform well in a wide range of ambient temperatures, ideally 62° to 72° F (16° to 22° C).

Avoid using or charging your device in ambient temperatures higher than 95° F (35° C), which can permanently reduce battery lifespan.

When using your device in a very cold environment, you might notice a decrease in battery life. This condition is temporary; when the battery’s temperature returns to its normal operating range, its performance will return to normal.

Software might limit charging above 80 percent when the recommended battery temperatures are exceeded.

Learn more about how temperature can affect your iPhone

How Wi-Fi and Bluetooth affect your battery

Wi-Fi and Bluetooth are designed to draw minimal power from the battery when they aren't connected to a network or accessory. For the best experience on your iPhone, keep Wi-Fi and Bluetooth turned on.

Some features might not work if you turn off Wi-Fi or Bluetooth