Charging iphone with full battery

Fast charge your iPhone

Use fast charge with certain iPhone models. You can recharge your iPhone up to 50 percent battery in around 30 minutes.

You can fast charge your iPhone 8 and later up to 50 percent battery in around 30 minutes. 1

Fast charging works when you use an Apple USB-C to Lightning cable and one of these adapters:

• Apple 18W, 20W, 2 29W, 30W, 61W, 87W, or 96W USB-C Power Adapter
• A comparable third-party USB-C power adapter that supports USB Power Delivery (USB-PD)

If you’re not sure which Apple Power Adapter you have, check the wattage on the top or bottom of the adapter:

1. Testing conducted by Apple in August 2017 using preproduction iPhone X, iPhone 8, and iPhone 8 Plus units and software, and in August 2018 using preproduction iPhone XS, iPhone XS Max, and iPhone XR units and software, with accessory Apple USB-C Power Adapters (18W Model A1720, 29W Model A1540, 30W Model A1882, 61W Model A1718, 87W Model A1719). Testing conducted by Apple in August 2019 using preproduction iPhone 11, iPhone 11 Pro, and iPhone 11 Pro Max units and software and accessory Apple USB-C Power Adapters (18W Model A1720, 29W Model A1540, 30W Model A1882, 61W Model A1947, and 87W Model A1719). Testing conducted by Apple in February 2020 using preproduction iPhone SE (2nd generation) units and software and accessory Apple USB-C Power Adapters (18W Model A1720 and 30W Model A1882). Testing conducted by Apple in September 2020 using preproduction iPhone 12, iPhone 12 mini, iPhone 12 Pro, and iPhone 12 Pro Max units and software and accessory Apple USB-C Power Adapter (20W Model A2305). Fast-charge testing conducted with drained iPhone units. Charge time varies with environmental factors; actual results will vary.

2. You need a 20W or higher power adapter to fast charge your iPhone 12.

Information about products not manufactured by Apple, or independent websites not controlled or tested by Apple, is provided without recommendation or endorsement. Apple assumes no responsibility with regard to the selection, performance, or use of third-party websites or products. Apple makes no representations regarding third-party website accuracy or reliability. Contact the vendor for additional information.

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How to wirelessly charge your iPhone

Learn how to wirelessly charge your iPhone with Qi-certified charging accessories.

What you need

Your iPhone features integrated wireless charging that allows for an easy and intuitive charging experience. Your iPhone works with Qi-certified chargers that are available as accessories and in cars, cafes, hotels, airports, and furniture. Qi is an open, universal charging standard created by the Wireless Power Consortium (WPC).

Many Qi-certified chargers charge iPhone with the latest version of iOS at rates up to 7.5 watts. These chargers are available at the Apple Online Store and Apple Stores.

Other Qi-certified chargers might vary in functionality and performance. If you have questions, contact the manufacturer.

Charge wirelessly

1. Connect your charger to power. Use the power adapter that came with your accessory or a power adapter recommended by the manufacturer.
2. Place the charger on a level surface or other location recommended by the manufacturer.
3. Place your iPhone on the charger with the display facing up. For best performance, place it in the center of the charger or in the location recommended by manufacturer.
4. Your iPhone should start charging a few seconds after you place it on your wireless charger.

You should see in the status bar.

Learn more

• Learn about charging with the MagSafe Charger and MagSafe Duo Charger.
• Wireless charging uses magnetic induction to charge your iPhone. Don’t place anything between your iPhone and the charger. Magnetic mounts, magnetic cases, or other objects between your iPhone and the charger might reduce performance or damage magnetic strips or RFID chips like those found in some credit cards, security badges, passports, and key fobs. If your case holds any of these sensitive items, remove them before charging or make sure that they aren’t between the back of your iPhone and the charger.
• If your iPhone isn’t charging or is charging slowly and your iPhone has a thick case, metal case, or battery case, try removing the case.
• If your iPhone vibrates—when it gets a notification, for example—your iPhone might shift position. This can cause the charging mat to stop providing power to your iPhone. If this happens often, consider turning off vibration, turning on Do Not Disturb, or using a case to prevent movement.
• Depending on the charging mat you have, you might hear faint noises while your iPhone charges.
• Your iPhone might get slightly warmer while it charges. To extend the lifespan of your battery, if the battery gets too warm, software might limit charging above 80 percent. Your iPhone will charge again when the temperature drops. Try moving your iPhone and charger to a cooler location.
• Your iPhone won’t charge wirelessly when connected to USB. If your iPhone is connected to your computer with USB, or if it’s connected to a USB power adapter, your iPhone will charge using the USB connection.

Information about products not manufactured by Apple, or independent websites not controlled or tested by Apple, is provided without recommendation or endorsement. Apple assumes no responsibility with regard to the selection, performance, or use of third-party websites or products. Apple makes no representations regarding third-party website accuracy or reliability. Contact the vendor for additional information.

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When to charge your iPhone or iPad

There’s a lot of myth and folklore surrounding charging iOS devices (or actually any device that uses Lithium technology batteries). A lot of it comes from the advice given for older technologies, such as Nickel-Cadmium or Nickel-Metal-Hydride batteries. None of this applies to Lithium, however, and some of what we «know» from the NiCd and NiMH days is actually harmful to modern battery technology.

So what are the «rules» for charging? The most basic one is charge whenever you want to, for a long as you want to. There’s no reason to let the device drain completely before charging (in fact, it’s a bad idea to do that on a regular basis), and there’s no need to wait until it reaches 100% before removing it from the power source. You can charge when it’s at 40% and disconnect when it reaches 80%, or any other values, without hurting the phone. And you don’t have to turn it off to charge it; in fact, you shouldn’t. And you can leave it plugged in while using it if you want to.

The Best Practice, however, is to charge the phone overnight, every night. As it stops automatically at 100% you can’t overcharge it doing this. You thus start the day with a fully charged phone. And, if you configure the phone for automatic backup using iTunes or iCloud, the phone will back up every night when it has a WiFi connection and is asleep.

With iOS 13 and later iOS devices now have an Optimized Charging option. With this enabled, if you charge overnight the phone will stop charging at 80%, then resume charging in time to reach 100% in time to meet your normal usage pattern. During the nighttime pause the phone will use mains power instead of battery power, allowing the battery to “rest”, and thus reducing the need to charge the battery quite as often; over the long term this will extend the useful life of the battery.*SEE NOTE BELOW The phone will resume charging to reach 100% when you are ready to use your phone; it will “learn” your usage pattern. The figure below shows how Optimized Charging works; notice that it started charging when put on a wireless charger around 9:30 PM, stopped charging at 80% a short while later, then resumed charging at 6 AM to reach 100% around 7 AM.

You can charge an iPhone, iPad or iPod Touch with any quality USB-A or USB-C power source and matching cable. Essentially any Apple power source and cable that fit into the connectors at either end are compatible and safe to use. There will be performance differences, with USB-C faster than USB-A to charge, but they will all work (except that a USB-A “cube” doesn’t have sufficient power to charge an iPad). For an iPhone 12 or later you can fast charge using a 20 watt or higher power USB-C that meets the PD spec. The Apple 20 watt and higher is PD compatible, but not all 3rd party power sources are yet.

Want more details?

• The «charger» for an iOS device is built into the device. It is not the thingy that plugs into the wall, and it is not the cable that connects the thingy that plugs into the wall to the phone. They are just a source of current and a way to get it to the phone, respectively.
• Completely draining a Lithium battery, even once, will kill it. (Unlike NiCd and NiMH, which people really would drain completely to prevent «memory effect»).
• The internal charger is «smart» — It will prevent the device from being overcharged, and it will attempt to prevent the device from totally draining the battery by shutting down the device before the battery is fully depleted.
• When the phone shuts off at 0% it really isn’t zero; there’s still sufficient charge on the device to prevent the battery from going completely flat. Likewise, 100% is not the maximum the battery can store; it stops charging slightly short of maximum to prevent overcharging.
• The worst thing you can do is drain the battery to 0%, then not charge it immediately. After it reaches zero and shuts off there’s a small amount of energy left, but if you leave it uncharged for long it WILL go flat and kill the battery. So if it reaches zero, charge it soon (within hours).
• It’s best to charge it when it goes below 20%, primarily to avoid the risk of it going to zero when you don’t have a charger available, and to prevent unexpected shutdowns when you might need the phone. The phone helpfully changes the color of the battery icon to yellow below 20% and enables Low Power mode to preserve the remaining charge for as long as possible.
• Never leave a phone unused for weeks or months on end without periodically recharging it. If it is going to be unused for a long period, Apple recommends leaving it at around 50% charged (not full, and not empty).
• You should only use high quality USB power sources to charge your iOS device. They don’t have to be Apple’s (although Apple makes good ones), but they should never be cheapo USB sources, both because they may damage the phone and they may even injure you.
• You should also use only high quality cables, as cables that do not meet Apple’s «Made for iPhone» (MFI) standards can damage your phone (see: Why Counterfeit Lightning Cables Kill iPhones — Motherboard)
• The power source needs to supply at least 1 amp to charge an iPhone, and 2 amps to charge an iPad. Note, however that a power source that can supply more than these values is OK to use; the internal battery charger will take only what it needs. So, for example, you can safely charge your iPhone with an iPad USB adapter. See this for more details: Using iPad power adapters with your iPhone, iPad, and iPod — Apple Support
• With the iPhone 8 and later you can also charge with a USB-C power source. This will charge the device much faster, but still safely. See this Apple support link—>Fast charge your iPhone — Apple Support
• For fast charging the iPhone 11 the recommended power source is the 13 watt adapter, and for the iPhone 12 and 13 Apple recommends the 20 watt adapter for the fastest charging. However, you can use a higher power adapter safely; the phone will only take the power it needs. Thus, if you have a 61 watt MacBook adapter it is safe to use that.
• iOS devices fast charge until they reach about 75%; the rate then slows down to prevent overcharging. So it will reach 75% very quickly (under an hour), but it can take a couple of hours more to reach full charge.

Finally, keep in mind that batteries are «consumables». Their capacity starts dropping the day they come off the assembly line. Battery life is determined primarily by «full charge cycles» — A full charge cycle is 0% to 100%, or any combination that adds up to 100%, such as 50% to 100% or 30% to 80% twice, 80% to 100% 5 times, etc. The battery will gradually lose capacity, and is rated to remain above 80% capacity (that’s total capacity, not charge level) for 500 full charge cycles for an iPhone (1,000 for an iPad). For most people this will be around 2 years for the iPhone. Apple will replace the battery for a reasonable fee (currently $49 US for older phones, $69 for iPhone X and later) if it goes below 80% after the original 1 year warranty or AppleCare+ warranty period. Within the warranty the replacement is free.

While this tip is specifically for iOS devices, the same principles apply to all other Apple devices (watches, AirPods, MacBooks) as well as most other manufacturer’s products that have Lithium chemistry batteries.

*More about Optimized Charging: I was asked by a user in the iPhone forum (https://discussions.apple.com/thread/251707376?answerId=253281558022#253281558022) why the iPhone does this. There is some evidence that Lithium chemistry batteries should not be left fully charged. So, for example, Tesla recommends not charging the car’s battery beyond 80% unless planning for a long trip, and in fact it can be programmed to do this. That doesn’t mean they should never be fully charged, just that they should not be left at 100% for long periods of time. Most electric bike instructions have the same advice. And Apple recommends storing devices that won’t be used for a while at 50% charge.

When the phone is connected to power and not charging the energy to run the phone comes from the external power source, rather than the battery, thus letting the battery “rest”. And any smartphone is always doing something that uses energy, even when it isn’t actually being used. As the battery’s useful life is measured in full charge cycles, with only a small contribution from chronological age, leaving the battery at 80% but still connected to power achieves 2 aims: Not leaving it at 100% for long periods of time, and reducing the number of full charge cycles while still powering the phone.

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