Apple advises that it can be normal for your iPhone to become warm in certain situations, including when charging it, when you first set it up, when you restore it from a backup and when apps re-index or re-analyse data (such as Photos tagging for faces, places, or keywords after a software update).
Yes it's normal. Phone gets hot because it's using fast charging until it reaches 60%. During fast charging phone is charged with higher voltage and amperage which heats up battery more than regular charging.
If your iPhone 12 gets hot while charging, there can be some issues with the charger and not your iPhone. The common issues can be: Your wall charger is not working properly. You're using a damaged cable to charge your iPhone.
Please read Mac notebooks: Operating temperature - Apple Support. It's normal for its temperature to increase while charging, which happens with any battery.
Have you noticed that your charger or smartphone heats up during a charge? When you put it on the bed or a cushioned surface? That's because this kind of surface restricts air flow on the device or charger. This essentially traps the heat and thereby increases the temperature.
While charging, the device and the charger may become hot. During wireless charging or fast charging, the device may feel hotter to the touch. This does not affect the device's lifespan or performance and is in the device's normal range of operation. If the battery becomes too hot, the charger may stop charging.
HD video, or using GPS navigation, and you're somewhere hot or have exposed the device to direct sunlight for a long period of time. Also, If you have an old or faulty battery, its energy output can be inconsistent, leading to it discharging a lot of heat that makes your phone hot.
Apple recommends that you keep your Mac in an environment that's between 50 and 95 degrees Fahrenheit (10-35 degrees Celsius). In summary, when the Mac gets hot during gaming, first look for the apps that are using too much computing power and quit them with the help of the Activity Monitor.
It is found that the iPhone gets extremely hot while performing activities that put heavy pressure on CPU, battery or GPU. Thus, mostly working on intensive applications like Waves, Google Maps, Facebook videos, Safari, or playing 3-D games, etc., for a long time can result in overheating.
What causes your iPhone XR to overheat? Smartphones can easily get warm from prolonged, extensive usage. There are also other factors that can heat trigger the phone to heat up so quickly. Among them are playing games, streaming music and videos, scrolling social media apps and when charging the phone.
Your device might get warm Restore from a backup. Wirelessly charge your device. Use graphics-intensive or processor-intensive apps, games, or features, including augmented-reality apps. Stream high-quality video.
But, if your phone overheats when charging, it's likely because your charging port is broken, the charging cable is worn out, or your battery is damaged. To test these components, charge your phone with a different charging cable or a different charging port — or use a wireless charger.
Warm is normal. The benchmark is 'too hot to handle' literally. If your ipad is ever too hot for you to hold, then you should stop using it and don't charge it and have it checked out. But warm is normal when batteries charge or when you use the device, especially for playing games or watching videos.
Smartphones may generate heat as their slim designs are not optimized for airing out heat or due to their excessive battery consumption. Both the device and the charger can generate heat while charging. The temperature may even feel warmer when charging with 'Super Fast Chargers' or wireless chargers.
The device gets very hot, even when charging without the case. I am afraid this might damage the battery on the long term -it is to my understanding that temperatures above 35°C do permanent damage to the Li-ion battery.