Why You Shouldn't Charge Your iPhone Battery Above 80%
May 13, 2024
iPhone Battery

Of course, it all depends on how you use your iPhone.

The iPhone 15 can make the device’s battery last longer as long as you don’t fully charge it, i.e. up to 100%.

In particular, according to Limewire, new iPhone 15 has more detailed information about the battery in the “Battery” section of the “Settings” app. One of the new features is an option to limit the maximum charge of the battery to 80% of the total capacity, so that the battery has a longer overall life.

James Herman, founder of MobileTech Addicts, said: “I’d say limiting charging to a maximum of 80% is a good way to extend your phone’s battery life. Lithium-ion batteries, which are used in most smartphones, degrade over time, and this process is accelerated by heat and full charge cycles. So by limiting the charge to 80%, you can reduce heat and stress on your battery, which can help it last longer.”

You want your battery to last as long as possible before you need to replace it, so the best way to achieve this is to only charge the battery up to 80%. Let’s say your phone battery normally lasts about ten hours. Limiting the battery charge to 80% only gives you eight hours.

If the main reason for keeping your battery healthy is to continue to hold its maximum charge and therefore last longer between charges, a shorter charge makes no sense. So what should you do?

“iPhone has a feature for optimized battery charging”
Most users should stick with the default settings and use their full battery capacity to get through the day. Running out of charge is more annoying than a slightly slower declining battery. What really degrades lithium batteries the fastest (besides consumption) is extreme temperature and time spent in a high or low state of charge.

Of course, it all depends on how you use your phone. If you rarely leave the house or work in an office where you can easily keep your phone charged, then this setup makes sense. But if you’re always out and about and forced to carry a spare battery just to get you through the day, then maybe you should just take the risk and charge your phone to 100% every time.

Limiting the charge works because phone batteries should not be completely full or empty, and they also get damaged when charged above 80% while the devices are hot. This is why fast chargers pump power into a battery up to 80% and then for the last 20%.

“Fast charging heats up the battery more than slow charging. You don’t need a fast charger next to your bedside while you sleep. I use a regular 5V USB charger,” said Michael Kim, battery expert and founder and editor of EV Charger Review. Still, he added: “iPhone already has a function for optimized battery charging – it learns your charging habits and keeps the battery at 80% overnight to finish charging to 100% just before you need it. This already reduces the time the battery spends in a high state of charge.”

The best solutions for battery charging
Even if you don’t have an iPhone 15, you can create a shortcut that sends a notification when the battery reaches 80%, so you can take it off the charger yourself.

But there are other ways to take care of your battery and make it last longer. “You can also extend your iPhone’s battery life by dimming the screen, reducing the time until sleep is activated, using power saver mode, limiting notifications and location services, and locking your phone when you’re not using it,” said Steven Athwal, a UK-based electronics and telecommunications expert.

Either way, it’s always a trade-off between using your phone and not using it. Sure, you can save your battery by turning off a lot of features, but only up to a point, since turning off features makes it pointless to even have a phone with you.

The most practical advice is to use the default settings on the iPhone, because Apple certainly knows better than anyone how to charge the battery best, never charge it in heat, keep your phone away from the Sun when charging it in car and make some sensible choices about saving energy.

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