Running out of iPhone battery when you're out and about can be incredibly frustrating, which is why so many people like to plug their phone in overnight and wake up to a fully-charged battery.

However, charging your iPhone to 100% of its battery capacity on a regular basis could actually be damaging your phone's overall battery life, meaning each charge is going to last for a shorter and shorter period of time.

iPhones use lithium-ion batteries which lose a little bit of power every time they're fully recharged. So, if you charge it up to 100% hundreds of times, you may have to replace the battery or even the phone to keep using it.

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To find out if charging has damaged your iPhone's battery, you can head to the device's Battery Health feature on the Settings app.

If the iPhone's charge capacity has reduced as a result of fully charging it, there are a few things you can do to mitigate this besides unplugging your iPhone when it reaches 80%.

'Optimized Battery Charging' is a feature which activates a 'trickle charge' mode, reducing the amount of power flowing into the battery after it reaches 80% charge.

This feature is activated by default in devices that use iOS 13 and later, but to double-check, open your Settings app and head to Battery > Battery Health. This should also be indicated on the Lock Screen when you plug your iPhone in.

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How do I make my iPhone battery last longer?

On its website, Apple explains that "'Battery life' is the amount of time your device runs before it needs to be recharged. 'Battery lifespan' is the amount of time your battery lasts until it needs to be replaced. Maximise both and you'll get the most out of your Apple devices, no matter which ones you own."

As well as ensuring your iPhone isn't regularly charged to 100%, there are a few key steps you can take to maximise your battery life and lifespan.

Avoiding extreme temperatures, whether hot or cold, is a key step to extending your battery life. The rechargeable batteries used by smartphones perform best between 16 C and 22 C. If it gets hotter than 35 C, as is predicted this week, battery capacity can be permanently damaged.

So, keep your iPhone out of direct sunlight, remove the case if it's made of a thick material, and don't charge it underneath a pillow.

It's also worth activating the iPhone's Low Power Mode via your device settings. This will reduce screen brightness and fine-tune your device's activity to make it run for longer.

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