iPhone charging on a table" width="884" height="495" srcset="https://ioutlet.pt/wp-content/uploads/2023/02/amazing_illustration_of_an_iphone_charging_3664ed55-55b9-455f-afa8-08e8dbd9facf.png 884w, https://ioutlet.pt/wp-content/uploads/2023/02/amazing_illustration_of_an_iphone_charging_3664ed55-55b9-455f-afa8-08e8dbd9facf-150x84.png 150w, https://ioutlet.pt/wp-content/uploads/2023/02/amazing_illustration_of_an_iphone_charging_3664ed55-55b9-455f-afa8-08e8dbd9facf-700x392.png 700w, https://ioutlet.pt/wp-content/uploads/2023/02/amazing_illustration_of_an_iphone_charging_3664ed55-55b9-455f-afa8-08e8dbd9facf-300x168.png 300w, https://ioutlet.pt/wp-content/uploads/2023/02/amazing_illustration_of_an_iphone_charging_3664ed55-55b9-455f-afa8-08e8dbd9facf-768x430.png 768w, https://ioutlet.pt/wp-content/uploads/2023/02/amazing_illustration_of_an_iphone_charging_3664ed55-55b9-455f-afa8-08e8dbd9facf-441x247.png 441w" sizes="(max-width: 884px) 100vw, 884px" loading="lazy" decoding="async">Most iPhones charge from empty to 50% in about 30 minutes with a 20 W or higher USB-C adapter, and reach a full 100% in roughly 1.5 to 2 hours. The exact time depends on three things — your charger's wattage, your cable, and your iPhone model — not on how new or old the phone is.
In this article
Every current iPhone uses the same lithium-ion battery technology, so charging speed comes down to hardware, not age. A higher-wattage charger and a good-quality cable will always charge an iPhone faster than an old 5 W adapter, whichever model you own.
iPhone charging time by model
These are typical ranges with a 20 W (or higher) USB-C Power Delivery adapter. Actual times vary slightly with battery health, ambient temperature, and whether the phone is in use while it charges.
Pro Max models sit at the higher end of each range because they carry a larger battery. With an old 5 W charger — the type that shipped with iPhones before the iPhone 12 — a full charge can take 3 hours or more.
Do you need to fully charge a new iPhone first?
No. That advice comes from old nickel-based batteries, which needed a long initial charge to calibrate correctly. iPhones use lithium-ion batteries, which have no such requirement. You can start using a new iPhone straight out of the box, charge it to whatever level is convenient, and top it up whenever you like — there's no "conditioning" cycle to follow, and no downside to charging in short bursts throughout the day.
How to charge your iPhone faster
- Use a 20 W+ USB-C Power Delivery adapter. Apple's older 5 W charger is noticeably slower.
- Use a good-quality cable. A worn or uncertified cable can bottleneck charging speed even with a fast adapter.
- Turn on Low Power Mode. It reduces background activity, leaving more power available for charging.
- Take the phone out of its case if it feels warm — heat slows down charging.
- Switch to Airplane Mode for the fastest possible charge, since the phone stops searching for a signal.
- Charge with a cable, not wirelessly. MagSafe and Qi charging are convenient, but slower than USB-C.
What is Optimized Battery Charging?
iOS includes a feature called Optimized Battery Charging. It learns your daily routine and, once it recognises a pattern, holds the charge around 80% until shortly before you normally wake up or unplug the phone, then finishes the last 20% quickly. The goal is to reduce the time the battery spends sitting at 100%, which is one of the main factors behind long-term battery wear. You'll find the toggle under Settings → Battery → Battery Health & Charging.
Is it bad to charge your iPhone overnight?
No. With Optimized Battery Charging enabled, iOS manages the charge curve automatically, and the phone stops drawing power once it reaches 100% — it isn't continuously topping itself up all night. Charging overnight is a normal, safe habit for the vast majority of iPhone users.
FAQ
Can I use any USB-C charger?
Yes. Any USB-C Power Delivery (PD) charger rated 20 W or higher will charge an iPhone at full speed. You don't need an Apple-branded charger — a compliant third-party USB-C PD adapter works the same way.
Does fast charging damage the iPhone battery?
Not meaningfully. Apple designs iPhones to handle fast charging, and the phone's internal thermal management automatically slows the charge rate if the battery gets too warm, protecting it over the long run.
Why is my iPhone charging slowly?
The most common causes are an old low-wattage charger (5 W instead of 20 W+), a damaged or uncertified cable, using the phone heavily while it charges, or a case that's trapping heat. Wireless charging is also inherently slower than a cable.
Looking to upgrade? iOutlet's refurbished iPhones are fully tested and come with a 24-month warranty. Browse refurbished iPhones.
Diagnostic tools
Get more articles like this one.
Refurbished tech analysis + €5 with BEMVINDO5 on your first order.
Looking for a refurbished iPhone?
At iOutlet every iPhone is tested and certified, with a 24-month warranty.
