The fastest way to charge is a high-wattage charger with a USB-C cable

iPhones charge fastest with a USB-C to USB-C cable and a charger rated 20 watts or higher. Apple's own 20W, 30W, and higher-wattage chargers work, but third-party chargers from Anker, Belkin, and others also work if they have USB Power Delivery certification. The difference is real: a 5W charger (the old standard) takes roughly twice as long as a 20W charger to reach 80 percent battery.

If your iPhone came with only a USB-A to Lightning cable, that cable itself limits speed. Upgrading to USB-C matters because the newer iPhones (15 and later) support faster charging over USB-C, while older models with Lightning ports max out at lower speeds. Check your iPhone model: if it has a USB-C port on the bottom, you can take full advantage of a high-wattage charger.

The charger you choose matters more than the cable alone. A 5W charger will not charge faster even with a premium cable. A 30W charger with a basic cable will charge faster than a 5W charger with an expensive one.

Key Takeaways

  • A 20W or higher USB Power Delivery charger with a USB-C cable cuts charging time roughly in half compared to the standard 5W charger.
  • iPhones 15 and later support the fastest charging with USB-C; older models with Lightning ports charge more slowly even with high-wattage chargers.
  • Turning off background app refresh, location services, and Bluetooth while charging removes power draws that slow the charging rate.
  • Removing your phone from its case and closing apps running in the background prevents heat buildup that forces the phone to throttle charging speed.
  • Wireless charging is slower than wired charging and generates more heat, so it is best for overnight charging rather than quick top-ups.

Close background apps and turn off wireless features while charging

Your iPhone charges slower when it is doing other things at the same time. Background app refresh, location services, Bluetooth, and Wi-Fi all draw power while the battery is filling. Turning these off during a charging session frees up power for the battery itself.

The easiest step is to put your phone in Airplane Mode while it charges. This disables cellular, Wi-Fi, and Bluetooth all at once. If you need to keep Wi-Fi on (to receive messages, for example), go to Settings > Wi-Fi and turn off Wi-Fi separately, then toggle Airplane Mode on. You lose cellular and Bluetooth but keep Wi-Fi active.

Close any apps running in the background by swiping up from the bottom of the screen (or swiping down from the top right on older models) and closing the app cards. Apps like Maps, Spotify, and email clients keep running even when you are not looking at them, and they consume battery power that could go to charging instead.

Remove the case and keep the phone cool

iPhone cases trap heat, and heat slows charging. When your phone gets too warm, iOS automatically throttles the charging speed to protect the battery. Removing the case during charging lets heat escape and allows the charger to deliver power faster.

If your phone feels warm to the touch while charging, move it away from direct sunlight and away from other heat sources like a laptop or heating vent. Charging in a cool room is faster than charging in a hot one. Some people place their phone on a cool surface (not metal, which conducts heat too aggressively) while charging, though straightforward removing the case usually solves the problem.

Avoid charging while using the phone. Scrolling, gaming, or streaming video generates heat on top of the charging heat, which triggers throttling. If you need to use your phone, wait until it reaches 80 percent and then use it normally.

Understand why wireless charging is slower

Wireless charging is convenient but slower than wired charging. A wireless charger typically delivers 7.5 to 15 watts, while a wired USB-C charger delivers 20 watts or more. Wireless charging also generates more heat because the energy has to cross the gap between the charger and the phone's coil, and some energy is lost in that transfer.

Use wireless charging for overnight charging or when speed does not matter. For a quick top-up during the day, plug in a wired charger instead. If you use wireless charging, remove the case for the same reason you would during wired charging: heat buildup throttles the speed.

Avoid charging to 100 percent every time

Charging to 100 percent every single time wears out your battery faster. iOS has a feature called Optimized Battery Charging that learns your charging habits and slows charging to 80 percent overnight, then finishes the last 20 percent closer to when you wake up. This keeps the battery healthier over time.

For daily use, aim to keep your phone between 20 and 80 percent charged. This is not always practical, but it extends battery lifespan. If you need a full charge for a trip or event, charge to 100 percent when you need it, but do not make it your routine.

Optimized Battery Charging is on by default. You can check it in Settings > Battery > Battery Health & Charging. If it is off, turning it back on will slow your overnight charging slightly but will add months to your battery's useful life.

Use Fast Charging mode on compatible iPhones

Some newer iPhones support a feature that prioritizes charging speed. On iPhone 15 and later, plugging in a high-wattage charger automatically enables faster charging. There is no setting to toggle; it happens automatically when the phone detects a capable charger.

If your iPhone is older, this feature may not be available. Check your phone's specifications or your manual to see if it supports fast charging. If it does, the only requirement is using a charger rated 20 watts or higher.

Replace an old or damaged charger

A charger that is cracked, frayed, or several years old may not deliver its rated wattage. Chargers degrade over time, especially if they have been dropped or exposed to heat. If your phone charges slowly even with a case removed and background apps closed, the charger itself may be the problem.

Test with a different charger if you have one available. If charging speed improves, replace the old charger. A new 20W or 30W USB Power Delivery charger costs between $15 and $35 and will charge your phone roughly twice as fast as a 5W charger.

Frequently Asked Questions

Does a higher-wattage charger damage my iPhone battery?

No. iPhones have built-in protection that prevents overcharging and heat damage. A 30W charger will not harm your phone; it straightforward delivers power faster until the battery is full, then stops. The phone controls how much power it accepts, not the charger.

Why does my phone charge slowly even with a new charger?

Heat buildup is the most common cause. Remove the case, close background apps, and make sure the phone is not in direct sunlight. If the phone still feels warm, it may have a hardware issue. Battery health also declines over time; check Settings > Battery > Battery Health & Charging to see your battery's condition.

Is it okay to use my phone while it charges?

You can, but it slows charging and generates heat. If you need to use your phone, wait until it reaches 80 percent, then use it normally. For the fastest charge, leave the phone untouched and in Airplane Mode.

Can I use a charger from a different brand?

Yes, as long as it has USB Power Delivery certification and is rated 20 watts or higher. Anker, Belkin, and other certified brands work just as well as Apple's chargers. Avoid very cheap chargers without certification, as they may not deliver the wattage they claim.

Does Optimized Battery Charging slow down my daily charging?

It only affects overnight charging. During the day, your phone charges at full speed. At night, it slows to 80 percent and waits until closer to your wake time to finish the last 20 percent. This protects battery health without affecting daytime charging speed.