iOS 18 introduced several new features, from home screen customization to iPhone mirroring. One lesser-known but valuable addition is the ability to detect slow chargers. If your iPhone isn’t charging quickly, as it should, you’ll get a clear ‘Slow Charger’ warning in the battery settings. This new feature of iOS 18 may be a surprise. So, we explore why the warning appears and how to fix it.
Why Do You See a ‘Slow Charger’ Warning?
The ‘Slow Charger’ warning appears in Battery settings (Settings > Battery) on your iPhone when you’re using a charger that isn’t certified for quick charging. Tapping the warning takes you to an Apple Support page (likely still under development). This slow charging alert may appear due to several reasons:
- You’re using an old low-power charger: Most iPhone models before the iPhone 11 came with a 5W power adapter in the box. While functional, it charges newer iPhones slowly, hence the warning. However, these older chargers are still perfect for overnight charging.
- You’re using a third-party charger: Some third-party chargers are not certified by Apple and may not provide optimal charging speeds for your iPhone. They could have lower wattage or lack Power Delivery (PD) support, essential for fast charging on newer iPhones.
- Your charging cable could also be the culprit: Your charging cable is as important as the adapter. If it is damaged or doesn’t support sufficient power transfer, your iPhone will charge much slower and may display a ‘Slow Charger’ warning in settings. Dirt or lint in the Lightning port can also hinder charging speeds.
- You may be using a wireless charger: Some wireless chargers, especially those designed for multiple devices, may not supply enough power to charge your iPhone quickly. That happens while charging multiple devices like your iPhone, AirPods, and Apple Watch simultaneously.
How to Get Rid of the Slow Charger Warning
While the ‘Slow Charger’ warning is harmless and indicates slower charging, you can get rid of it on your iPhone with the following:
- Use a charger designed for your iPhone model.
- Use a charger with the correct wattage. The iPhone 12, iPhone SE (3rd generation), and later models require a power adapter with a minimum power output of 20 watts for fast charging, such as the Apple 20W USB power adapter.
- If not using an Apple charger, use reputable third-party chargers that support Power Delivery.
- Ensure the charging cable supports fast charging.
Other Factors That Can Slow Down iPhone Charging
Besides the charger and cable, several other factors can contribute to slower charging speeds on your iPhone:
- Optimized Battery Charging: This feature, enabled by default on iOS 13 and later, learns your charging habits and delays charging past 80% to preserve battery health. While beneficial in the long run, it can slow down the initial charging speed. You can temporarily disable this feature if you need a faster charge.
- Clean Energy Charging (iOS 16.1 and later): This feature aims to reduce your carbon footprint by charging your iPhone when the power grid is using cleaner energy sources. However, depending on the current energy mix, it can sometimes slow down or even pause charging temporarily. You can disable this feature if you need a faster charge.
- Background Activity: Actively using your iPhone or running power-hungry background tasks (like downloading software updates, updating apps, or gaming) can slow down charging by a bit. Close unused apps and reduce background activity for faster charging.
- Extreme Temperature: Extremely hot or cold environments can slow down your iPhone’s charging speed and affect its battery health. In those cases, your iPhone will show a ‘Charging On Hold’ message. Avoid exposing your iPhone to direct sunlight or extreme temperatures while charging.
- Software or Hardware Issues: In rare cases, a faulty charging port or other hardware problems can prevent your iPhone from charging or cause it to charge slowly. Try restarting your iPhone to see if the issue persists. If it does, contact Apple customer support for further assistance.
Keep Your iPhone Charged and Happy
The ‘Slow Charger’ warning in iOS 18 is a helpful notification to ensure you’re using the right charger. It indicates that slow charging is likely due to the charger or cable, not a problem with your iPhone. While you can’t directly measure the power your iPhone draws like on Android (unless you use a power meter cable), this warning helps you determine if there’s an issue with your charger. A well-charged iPhone is a happy iPhone, after all.
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