The hidden iPhone setting you should never switch off to avoid ‘battery killer’ mistake

APPLE'S iPhone batteries have definitely improved over the years but you still need to be careful with how you treat them.

If you're someone who leaves your phone on charge overnight or for long periods, there is one iPhone setting you should probably avoid switching off.

Apple's Optimized Battery Charging setting is hidden within the Battery Health section of your iPhone.

You may have been alerted to it before.

If your iPhone picks up on the fact you charge your phone for long periods, it should send you a notification saying Optimized Battery Charging is being used.

This is a setting that you can switch off if you want your phone to charge quicker but it's not advisable to leave it off for long.

The setting is in place to prevent you from killing your battery quicker than usual.

Apple says: "To reduce battery aging, iPhone learns from your daily charging routine so it can wait to finish charging past 80% until you need to use it."

Every iPhone contains a lithium ion battery that degrades over time.

That means over time, the battery will hold less charge than when it was brand new.

Keeping a battery charged and charging at 100% isn't great for the cell.

That's not an easy process to manage while you're asleep so Optimized Battery Charging does this for you.

To find the feature go into Settings > Battery > Battery Health > Optimised Battery Charging.

Make sure it's toggled on to activate the feature and only turn it off if you want a speedy charge on certain occasions.