Symptoms
- Phone feels warm to hot to the touch while plugged in
- Heat or temperature warning message appears on screen
- Phone slows down or dims while hot
- Heat continues even after unplugging
Likely causes
- CommonCase trapping heat during chargingThick cases, especially with wireless charging, insulate heat that would otherwise dissipate.
- CommonUsing demanding apps while chargingGaming, video, or navigation while plugged in adds processor heat on top of charging heat.
- CommonCharging in direct sunlight or a hot roomAmbient heat combines with charging heat to push the phone into its thermal limit.
- PossibleFast or wireless charger generating extra heatHigher-wattage charging and wireless charging both produce more heat than standard wired charging.
- Less commonA swelling or failing battery generating heatA battery that is physically damaged or swelling can overheat even at rest.
What to do
- Remove the case while charging and see if the heat lessens.
- Move the phone out of direct sunlight and away from other heat sources.
- Avoid using demanding apps like games or GPS navigation while it's plugged in.
- If using a wireless charger, switch to a wired cable to compare heat levels.
- Let the phone cool down before continuing to use it if it shows a temperature warning.
- Check the back of the phone for any bulging, which points to a battery issue rather than normal heat.
- If heat is severe and paired with bulging or the screen lifting away from the frame, stop charging immediately.
- If the phone regularly runs hot even under light, cool conditions, have the battery checked.
When to call a pro
If the case, environment, and usage aren't the cause and the phone runs hot at rest, have the battery inspected by a manufacturer service center or authorized repair shop.
Safety
If the phone is bulging, the screen is separating from the body, or it's hot enough to be uncomfortable to hold, stop charging, unplug it, and set it on a non-flammable surface away from anything that can burn.