Charge and maintain your iPhone battery
Find out 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.
Find out about iPhone charge cycles
Find out 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 Optimised Battery Charging. To improve your battery's lifespan, Optimised Battery Charging reduces the time 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.
Find out more about charging optimisations
How temperature affects your battery
iPhone is designed to perform well in a wide range of ambient temperatures, ideally 62°F to 72°F (16°C to 22°C).
Avoid using or charging your device in ambient temperatures higher than 35°C (95°F), which can permanently reduce battery lifespan.
When using your device in a very cold environment, you may 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 may limit charging above 80 percent when the recommended battery temperatures are exceeded.
Find out 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 may not work if you turn off Wi-Fi or Bluetooth
