How to Charge Your iPhone the Right Way

The basics: plug in, wait, unplug

Charging an iPhone is straightforward: connect the cable to the port at the bottom of the phone, plug the other end into a power adapter, and plug the adapter into a wall outlet or USB power source. Your iPhone will show a lightning bolt icon on the battery indicator when it is charging. Most iPhones reach a full charge in one to three hours, depending on the model and the power adapter you use.

You can use your iPhone while it charges. The phone will charge more slowly if you are using it heavily — playing games, streaming video, or running other apps — but it will still charge. If you want the fastest charge, put the phone in airplane mode or turn it off entirely.

Your iPhone will stop charging automatically once it reaches 100 percent. Leaving it plugged in after that point does not damage the battery, though modern iPhones have a feature called optimized battery charging that slows charging to 80 percent overnight if you regularly charge at the same time each day, then finishes the last 20 percent closer to when you wake up. This reduces the time the battery spends at full charge, which extends its overall lifespan.

Key Takeaways

Use the USB-C or Lightning cable that came with your iPhone and any USB power adapter rated for at least 5 watts; faster adapters (20 watts and up) charge the phone more quickly without damaging the battery.
Wireless charging works on iPhone 8 and newer models and charges more slowly than a wired connection, but is convenient for overnight charging.
Optimized battery charging automatically slows charging to 80 percent at night and finishes the last 20 percent in the morning, which helps the battery last longer over years of use.
Heat damages batteries more than charging speed does, so avoid charging in direct sunlight or in a hot car, and remove thick cases during fast charging if the phone gets warm.

Wired charging with a cable and adapter

iPhones use either a Lightning connector (iPhone 12 and earlier) or a USB-C port (iPhone 15 and newer). The cable that came in the box with your phone is the right one to use. If you need a replacement cable, buy one made by Apple or one certified by Apple — third-party cables sometimes work, but uncertified ones may charge slowly or damage the battery over time.

The power adapter matters more than most people think. Any adapter rated for at least 5 watts will charge your iPhone, but faster adapters (20 watts, 30 watts, or higher) charge the phone much more quickly. A 5-watt adapter takes three to four hours for a full charge; a 20-watt adapter takes about one and a half hours. Faster adapters do not damage the battery — Apple's own fast chargers are 20 watts and up. If you charge overnight or do not mind waiting, a slower adapter is fine. If you need the phone ready in an hour, use a faster one.

The cable and adapter work together. A fast adapter with a damaged cable will charge slowly. A good cable with a weak adapter will also charge slowly. If your phone charges much more slowly than it used to, try a different cable first, then a different adapter.

Wireless charging

iPhones from iPhone 8 onward support wireless charging using a Qi-compatible charging pad or stand. You straightforward place the phone on the pad — no cable needed — and it begins charging. Wireless charging is slower than wired charging (usually taking three to four hours for a full charge) but is convenient for overnight charging or for keeping the phone topped up during the day without plugging in repeatedly.

Wireless chargers vary in power. Most standard pads deliver 5 watts, which is slow. Some third-party pads deliver 7.5 or 10 watts and charge faster. Metal cases or thick cases can block the wireless signal, so remove the case or use a case designed for wireless charging. The phone may get warm during wireless charging, which is normal, but if it gets hot to the touch, move it away from direct sunlight and let it cool before charging again.

Fast charging and MagSafe

iPhone 12 and newer models support MagSafe, a magnetic attachment system that works with both wired and wireless chargers. MagSafe wireless chargers deliver up to 15 watts and charge faster than standard Qi pads. MagSafe cables snap magnetically to the back of the phone, which is convenient but does not charge faster than a regular USB-C cable — the speed depends on the power adapter, not the cable type.

To use MagSafe wireless charging, buy a MagSafe charger pad or stand and plug it into a power adapter. Place your iPhone on it, and the magnets will align the phone automatically. MagSafe chargers cost more than standard Qi pads but are worth it if you charge wirelessly often, because the alignment is reliable and the charging speed is noticeably faster.

Protecting your battery while charging

Heat is the main enemy of iPhone batteries. Charging in a hot environment — direct sunlight, a hot car, or near a heat source — slows charging and degrades the battery faster than charging speed does. If your phone gets warm while charging, move it to a cooler location and remove any thick case. It is normal for the phone to be slightly warm during charging, but it should not be hot to the touch.

Avoid leaving your iPhone in a car on a hot day, even if it is not plugged in. Batteries degrade quickly at high temperatures, and a car interior can reach 130 degrees Fahrenheit or higher in summer. If you must leave the phone in a car, put it in the glove compartment or under a seat where it stays cooler.

Do not charge overnight every single night if you can avoid it. If you must charge overnight, turn on optimized battery charging in Settings > Battery > Battery Health & Charging. This feature learns when you usually charge and slows charging to 80 percent until closer to wake-up time, which reduces the time the battery spends fully charged and extends its lifespan.

Troubleshooting slow or no charging

If your iPhone is not charging or charges very slowly, try these steps in order. First, check the cable and adapter for visible damage — fraying, bent connectors, or cracks in the plastic. If you see damage, replace the cable or adapter. Second, clean the charging port on the phone and the connector on the cable with a dry cotton swab or a soft brush. Lint and dust block the connection and are the most common cause of slow charging.

Third, try a different cable and adapter. If the phone charges normally with different equipment, the original cable or adapter is faulty. Fourth, restart the phone by turning it off and back on. Fifth, if the phone still does not charge, check whether it is in a very cold environment — batteries charge slowly below 32 degrees Fahrenheit and will not charge at all below about 50 degrees. Move the phone to a warmer location and wait a few minutes before trying again.

If none of these steps work, the battery itself may be failing. Check the battery health in Settings > Battery > Battery Health & Charging. If the maximum capacity is below 80 percent and the phone is more than two years old, the battery is aging normally. If it is much lower or the phone is newer, contact Apple or visit an Apple Store.

Choosing the right charger for your situation

If you charge at home and do not mind waiting, a standard 5-watt adapter is fine and costs less. If you charge at work or travel frequently and need the phone ready quickly, buy a 20-watt or faster adapter — the time saved adds up. If you charge wirelessly overnight, a standard Qi pad is adequate; if you charge wirelessly during the day, a MagSafe charger is worth the extra cost because it aligns automatically and charges faster.

Buy chargers from Apple, from the phone's manufacturer if you use Android, or from brands that certify their products with the manufacturer. Uncertified third-party chargers are cheaper but may charge slowly, overheat, or damage the battery. The cost difference between a good charger and a bad one is usually ten to twenty dollars, which is worth paying to avoid replacing the battery or the phone.

Frequently Asked Questions

Is it bad to leave my iPhone plugged in overnight?

No. Modern iPhones stop charging at 100 percent and will not overcharge. Optimized battery charging slows charging to 80 percent at night and finishes the last 20 percent in the morning, which is even better for long-term battery health. If you charge overnight regularly, turn on optimized battery charging in Settings > Battery > Battery Health & Charging.

Can I use a fast charger, or will it damage the battery?

Fast chargers do not damage the battery. Apple's own chargers are 20 watts and faster. The phone manages the charging speed automatically and will not accept more power than the battery can safely handle. Faster chargers are safe and will charge your phone more quickly.

Why does my iPhone charge slowly with some cables?

The cable or adapter may be damaged, or lint may be blocking the charging port. Try a different cable and adapter first. If the phone charges normally with different equipment, the original cable or adapter is faulty. If it still charges slowly, clean the charging port with a dry cotton swab.

Is wireless charging slower than wired charging?

Yes. Standard wireless chargers deliver 5 watts and take three to four hours for a full charge. Wired chargers with a 20-watt adapter take about one and a half hours. MagSafe wireless chargers deliver up to 15 watts and are faster than standard pads but still slower than wired charging.

What should I do if my iPhone gets hot while charging?

Move the phone to a cooler location away from direct sunlight, remove any thick case, and let it cool before charging again. Heat damages batteries, so avoid charging in hot cars or in direct sun. If the phone gets hot regularly during normal charging, the battery or charger may be faulty — contact Apple.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.