If you’re an iPhone user, you may have experienced this problem – your iPhone stops charging at 80%. Even if you leave it connected to the charger overnight, it won’t reach 100%. This can be frustrating, especially when you need a fully charged phone before leaving the house.
But why does this happen? Well, it turns out that this is a smart feature built into the iPhone. Here’s why your iPhone stops charging at 80%.

Battery Health

The primary reason why your iPhone stops charging at 80% is to protect your battery health. Lithium-ion batteries, which are used in most smartphones, operate best when they are kept between 20% and 80%. Keeping your battery within this range prolongs its lifespan and prevents degradation.

When your iPhone reaches 80%, it stops charging to prevent overcharging, which can damage your battery cells. Over time, this can cause your battery to lose its capacity, reducing its overall lifespan. By stopping the charging process at 80%, Apple is helping to preserve the longevity of your battery.

Fast Charging

Another reason why your iPhone stops charging at 80% is because of fast charging. If you have an iPhone 8 or later model, you can use fast charging to quickly charge your phone. However, fast charging is only available up to 80%. After that, your iPhone switches to regular charging mode, which is slower but safer for the battery.
If you want to charge your iPhone quickly, you can use a fast charger and enjoy the benefits of fast charging up to 80%. However, if you need a full charge, you’ll have to wait a bit longer.