Phone Overheating While Charging? When to Worry and What to Do
A phone that feels warm while charging is normal, especially on a fast charger, a wireless pad or while you use it. Worry when it is too hot to hold, shows a temperature warning, stops charging, stays hot after you unplug it, or the back starts to bulge. Here is how to tell the difference and what to do.
The short answer
Charging puts energy into the battery, and some of it comes out as heat. Fast charging and wireless charging make more heat than a slow cable charge, so a warm phone on a fast charger is expected. Apple says an iPhone can feel warmer during wireless charging, setup, updates and demanding tasks, and should cool down when the activity ends. Samsung says the same about fast and wireless charging, and that this normal warmth doesn’t affect the phone’s lifespan or performance.
What isn’t normal is heat that is uncomfortable to hold, heat that keeps building, heat with a burning smell, or a phone that is hot when it is barely doing anything.
Normal warmth or a problem?
- Usually normal: warm on the back near the camera or the middle, while fast charging, wireless charging, gaming, streaming, using navigation, restoring a backup or installing an update. It cools within a few minutes after you stop.
- The phone protecting itself: charging slows or pauses, the screen dims, the camera flash is disabled or apps slow down. iPhones can show Charging On Hold; Galaxy phones show an overheating warning and stop charging until they cool. This is a safety feature working, not a fault on its own.
- Worth checking: hot when idle on the charger, hot every time on a charger that used to be fine, the charger or cable plug gets hot, or the battery runs down much faster than before.
- Stop now: the back or screen is lifting, the phone rocks on a flat table, there is a chemical or burning smell, smoke, or the phone is painful to touch.
What to do right now
- Unplug it and stop using it. Close games, the camera and navigation.
- Take the case off. Thick, rugged and leather cases hold heat in.
- Move it somewhere cooler, out of direct sun and off beds, sofas and pillows, which trap heat underneath.
- Let it cool on its own. If it is very hot, switch it off for a few minutes. Don’t put it in a fridge or freezer or next to ice: sudden temperature changes are bad for it.
- Charge again once it is cool, on a hard surface, without using it.
Apple’s guidance is that an iPhone is designed for ambient temperatures of 0 to 35 °C (32 to 95 °F), and that it shouldn’t be left in a parked car. A phone charging on a sunny dashboard or windowsill is outside that range before the charger adds any heat of its own.
Step-by-step checks to find the cause
1. Is it the way you charge?
Using the phone while it charges is the most common cause. Gaming or streaming on a fast charger makes the processor and the battery heat up at the same time. Leave the phone alone for one charge and see if it stays cooler. Charging in a thick case or under a pillow does the same.
2. Is it the charger or the cable?
Feel the charger and both ends of the cable. A hot plug at the phone end points to the cable or the port. Samsung warns against using a cable with damaged or peeled covering, or a charger that is damaged. Swap in a charger and cable you know are good, ideally the phone maker’s own or a certified one. Our charger checker shows what speed your phone should get from a specific charger, so you can see whether it is fast charging at all, and the cable checker explains which cable ratings your phone needs.
3. Is the charging port dirty or damaged?
Lint, sand or a bent contact makes a poor connection, and a poor connection gets hot. Samsung names liquid, dust and metal powder in the port as causes of overheating. Switch the phone off, look in with a torch (flashlight), and lift out lint gently with a wooden toothpick. Don’t use metal. If the plug wobbles or only charges at an angle, the port needs a repair.
4. Is it wireless charging?
Wireless charging is less efficient than a cable, so more of the energy turns into heat, and a misaligned phone is worse. Take off the case if it isn’t made for wireless charging, and remove cards, metal plates or magnetic ring holders from between the phone and the pad. Samsung specifically warns about metal and magnets in that gap. If the phone still gets hot, try a cable charge and compare.
5. Is an app or update working in the background?
After an update or a restore, a phone can run hot for a while as it indexes photos and syncs. That should settle in a day or so. If it doesn’t, check the battery usage list (Settings → Battery) for an app using far more than you would expect, then update or remove it. Restart the phone; it clears stuck processes.
6. Is the signal weak?
A phone on a weak mobile signal raises its radio power, which adds heat. If it only gets hot in one room, try Wi-Fi with mobile data off, or airplane mode, while it charges.
7. Is the battery worn?
A worn battery has higher internal resistance and gets warmer under the same load. If the phone also dies early, shuts down at 20%, or the percentage jumps, check the battery health; our battery health guide shows where to find it on iPhone, Samsung and Pixel. On a Galaxy, the Samsung Members app has Phone diagnostics with a battery check.
What the result means
- Cooler with a different charger or cable: the accessory was the problem. Stop using it.
- Cooler when you don’t use it while charging: nothing is wrong. Charge while you sleep or while you aren’t gaming.
- Cooler on a cable than on the pad: check alignment and what is in between. Some pads just run warm.
- Hot with every charger, cool between charges: the port or the battery is the likely cause.
- Hot even when not charging or barely used: an app, the battery or another hardware fault. Get it checked.
Our battery test shows, in Chrome, Edge or Samsung Internet, whether the phone reports that it is charging. If it flickers between charging and not charging when you move the cable, the connection is loose, which also explains heat at the plug.
When to repair or replace
- Charger or cable: replace it. It is the cheapest fix and the most common one.
- Charging port: a port repair or cleaning is usually much cheaper than a new phone. On many phones the port is a separate part.
- Battery: if health is around 80% or lower and the phone runs hot, a battery replacement often fixes both problems. Use the maker’s service or an authorised shop.
- Swollen battery: get it replaced straight away, and don’t charge it in the meantime.
- Replace the phone if it overheats on good accessories with a new battery, or the repair costs more than the phone is worth.
If the phone is under warranty or AppleCare, contact the manufacturer before a third-party repair, because some repairs void the warranty.
Habits that keep charging cool
- Charge on a desk or nightstand, not a bed, and not in direct sun.
- Take off a thick case for long charges.
- Use the built-in charge limits: Optimized Battery Charging or the 80% Limit on iPhone, Protect battery on Samsung, Adaptive Charging on Pixel.
- Save fast charging for when you need it, if your phone lets you turn it off. Heat wears batteries faster than anything else.
If your phone charges slowly as well as getting hot, our slow charging checklist covers chargers, cables and settings in more detail.
Frequently asked questions
Is it normal for my phone to get hot while charging?
Warm is normal, especially with fast charging, wireless charging or when you use the phone while it charges. It should cool within minutes after you stop. Too hot to hold, a temperature warning, or heat when the phone is idle is not normal.
Why does my iPhone get hot when charging?
Usually because it is fast or wireless charging, restoring a backup, installing an update, or being used at the same time. Apple says it should cool when the activity ends. If it shows Charging On Hold, it has paused to protect the battery and will resume once it cools.
Is it normal for an Android phone to get hot while charging?
Yes, some warmth is normal on fast and wireless charging. Samsung says this warmth doesn’t affect the phone’s lifespan. If a Galaxy phone shows an overheating warning, it stops charging until it cools. Repeated warnings on a good charger point to the port, the battery or an app.
Can a phone explode from overheating while charging?
It is rare. Phones slow or stop charging when they get too hot. The danger signs are a swelling battery, smoke or a burning smell. If you see any of them, unplug the phone, put it on a hard surface and don’t charge it again until it is checked.
Should I put my hot phone in the fridge?
No. Avoid the fridge, freezer, ice packs and cold water, because sudden temperature changes are bad for the phone. Unplug it, take off the case, move it out of the sun and let it cool at room temperature. Switching it off for a few minutes helps.
Can a bad charger make my phone overheat?
Yes. A damaged cable, a worn plug or a cheap uncertified charger can make a poor connection that heats up. Feel the charger and both ends of the cable. If a known-good charger stays cooler, replace the old one. Our charger checker shows what speed to expect.
Does overheating damage the battery?
Repeated heat is the main thing that wears a phone battery. Apple warns that heavy use in very hot conditions can permanently shorten battery life. Occasional warmth on a fast charger is fine; regular charging in the sun or under a pillow is not.