You're in a hurry: iPhone plugged in, coffee downed, off to the door! Except that when you grab your phone, you discover that it has barely gained a few percent… Frustrating, isn't it? Is your iPhone charging slowly? It's a classic problem. which I've encountered myself since my very first models. Good news: the mysterious failure is rare. In most cases, the solution lies somewhere between the charger, the cable, and two or three slightly hidden settings.
Apple doesn't engage in the wattage arms race like some Android manufacturers. The company prefers a more cautious approach to preserve battery life. As a result, we sometimes think our device is "sluggish" when it's simply following Cupertino's guidelines. Rest assured, There are several solutions to speed up charging without risking burning out the battery.
What Apple actually calls "fast charging"
The concept of fast charging is quite relative. Since the iPhone 12, Apple has advertised a theoretical peak of 20W with its official USB-C adapter. On more recent generations, the power increases slightly, but it remains far from the records set elsewhere. Your iPhone will not exceed the limit that Apple has set. even if you plug in a charger capable of delivering 100W.
This limit should be seen as a safety barrier. By restricting temperature and chemical stress, Apple primarily aims to ensure your battery lasts for several years. Trying to exceed these limits is like forcing the door: at best, the phone won't comply; at worst, it will reduce power to protect itself.
Accessories: the charger or cable is often the culprit
You've probably noticed: since the iPhone 12, Apple no longer includes a power adapter in the box. Many users are therefore reusing an old 5W charger or a third-party model found at the back of a drawer. This is the primary culprit when an iPhone charges slowly.
To take full advantage of its power, two conditions must be met:
- Un USB-C Power Delivery compatible charger if your iPhone has a USB-C port or an MFi certified USB-C to Lightning cable if your device still uses Lightning. Without this compatibility, the phone automatically limits itself to a "safe" mode around 7,5W.
- A cable in good condition The cable sheath is intact, the connectors are clean, and there are no excessive bends. A single damaged wire increases resistance and causes the iPhone to slow down charging to prevent overheating.
I've already observed a difference of nearly 40% between a brand new cable and a worn-out one that was lying around in my car. Suffice it to say, a small investment in a certified accessory can make all the difference.
It's iOS's fault
Even with the best charger-cable combo, sometimes the battery icon fills too slowly. This time, the cause might be softwareSince iOS 13, the "Optimized Charging" option learns your habits. It stops charging around 80% and then finishes charging just before the time you usually unplug your phone. The goal: to reduce the time spent at 100% and slow down the chemical wear on your battery.
If your routine suddenly changes—earlier train, long weekend—the algorithm hasn't yet adjusted to these new times. The result: you get your iPhone back at 82% and you curse the slow charging. Temporarily disable the option in Settings > Battery > Charging > Optimized Battery Charging If you need a quick recharge, then reactivate it afterwards to continue pampering your battery.
Another software factor is internal temperature. During an iOS update, a 4K photo shoot, or a demanding game, the processor overheatingThe iPhone then reduces the charging power to avoid exceeding the critical limit. Even if you have a 30W charger, the phone will never draw on that reserve while it's busy with other tasks.
Ambient temperature and usage habits
The scene repeats itself every summer: iPhone placed on the dashboard, sun at its zenith, battery that stagnates. Ambient heat is the number one enemy for efficient charging. Above 35°C, the system prefers to slow down charging rather than risk overheating. The moral of the story: use an indoor power outlet or place your phone near a cool air vent if you need to charge in the car.
Simultaneous use has the same effect. Listening to a streaming podcast, launching Maps for GPS, replying to a few Slack messages… all these small actions continuously drain the battery and limit the available charge. The ideal solution, therefore, remains to leave the iPhone at rest until he regains his strength.
My advice for regaining a decent load
Experience shows that three simple actions are often enough to break the bottleneck:
- Opt to 20W USB-C Power Delivery certified charger and an official or MFi-certified cable. This will ensure your iPhone has full power at its disposal.
- Keep the device cool Remove the thick case if necessary, place it in the shade and avoid heavy use while charging.
- Monitor your settings Temporarily disable "Optimized Charging" and close power-hungry applications if you are in a hurry.
Applied together, These tips can save you several tens of minutes. on a full charge. Your iPhone won't transform into a 120W supercar, but it will achieve the best balance between speed and longevity.
Now you're equipped to avoid those endless waits in front of the battery gauge. When your iPhone is charging slowly, the solution almost always lies in the accessories, the temperature, or the smart settings.A quick detour through these three pillars and you'll get back to your business with a light heart and a full phone in your pocket.
