IF your iPhone is constantly running out of juice, a rogue app might be to blame.
Thankfully there's an easy way to find out what's going wrong.
Inside your smartphone are tiny computer chips that let it run the camera, watch a video, and everything else.
The more difficult the task (or badly designed the app), the harder processors have to work – draining more juice from your battery.
Some tasks happen in the background, like tracking your location for Google Maps, or checking with Facebook for new notifications.
You don't see these tasks happen, but they're still draining your battery life.
How to uncover greedy iPhone apps
Your iPhone has a built-in Apple tool that lets you uncover exactly which apps are draining your battery life.
Head into Settings > Battery, and then wait for the page to load.
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Next, tap on the 'Last 10 Days' option, which reveals battery usage for different apps from the past week-and-a-half.
If you scroll down, you can see the apps that have used the majority of your battery life, in percentage form.
So if an app has 20% next to it, that means it hoovered up a fifth of all battery life used in the past 10 days.
You can also toggle it to show the listed items by activity – keeping them ordered by battery usage.
So if you've spent very little time on an app but it's high on the list for usage, that means it's a battery killer.
This section also splits up the time that the app was running in the background.
Watch out for apps that use lots of battery and rack up lots of background usage time – they're particularly bad for your battery life.
You can delete any apps that are causing problems, or you can turn Low Power Mode on at the top.
Low Power Mode will temporarily reduce background activity on your iPhone, until you can fully charge the handset.
Of course, it's entirely possible that your iPhone's maximum battery capacity has fallen.
In the Battery section of your device, you can see your maximum capacity.
This tells you the exact percentage of charge your iPhone battery holds, compared to when it was new.
For people with battery life woes, the percentage is important.
A battery is considered "worn" if it's below 80%, which means it's time to upgrade your battery.
You'll typically reach this point after doing 500 full charges – which will take most users less than two years.
If you're still in warranty, you can claim a battery swap for free at the Apple Store. Everyone else will have to pay a fee.
It's $79/£79 for a battery replacement, which is significantly cheaper than buying a brand new iPhone.
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