With iOS 18, Apple has already introduced a clever new way to identify if the mode in which you charge your iPhone is operating at speeds below the threshold they determine as "optimal." This new feature appears directly in Settings, which makes it easy to detect when you're not getting the fastest charge possible or when you are slowly charging your iPhone.
First of all, it is worth asking What do we mean by slow charger? The answer is simple, those shippers who deliver a power of 7,5W or less through a wired system, the chargers Magsafe with less than 10W power, when we connect our iPhone to charge in the USB hubs that are not chargers as such (for example, the one in a car) or chargers that are delivering power to multiple devices and cannot reach powers higher than those mentioned above.
Knowing this, if we go to Settings > Battery, We will see a Slow Charge message when our iPhone detects that the charger we are using is “slow”You will also be able to identify it because in the Battery Level graph the charges will be shown in orange.
But not everything depends on the charger alone There may be situations where our iPhone is receiving a slow charge even with a “fast” charger. For example, if we have headphones connected to our iPhone while it charges wirelessly, the charge is limited to 7,5W for safety. Also, if we are using functions that require a lot of energy demand such as maximum screen brightness, playing video games or streaming video, the iPhone manages the charging speed so as not to overheat. Even being able to stop charging until the temperature is stable again.
Personally I use slow charging every night (wirelessly) to charge my iPhone and a fast charger (20W, not too crazy) for when I need to go out early and there won't be enough time with a slow charge. This way you help maintain the battery by always keeping temperatures lower than with a fast charger, and over the (very) long term, you can notice it. I don't mean to say that charging it with a 20W charger every day is bad, but potentially drains the battery more in the long run (you know, that damn battery health percentage that some of us look at so much).
