🔌 Why Does My Phone Get Hot While Charging? (iPhone, Samsung & More Explained)
Whether it's an iPhone 16, Samsung Galaxy S24 or Xiaomi 14, feeling warm when charging your smartphone can be worrying. But is it harmful? Why is this more likely to happen with a fast charger or a GaN charger?
This article explores:
· Why your phone heats up while charging
· Is heating normal or dangerous
· Tips to prevent overheating
· Safe charger choices for users in Europe, America, the Middle East and other regions
Let's uncover the truth.
⚡ Why Does My Phone Heat Up While Charging?
1. Fast Charging Generates More Power Conversion
Modern phones use fast charging protocols like PD (Power Delivery) or PPS (Programmable Power Supply), pushing higher wattage (18W–65W+). That speed comes at a cost: power conversion = heat.
Example: A 27W fast charge on iPhone 16 Pro Max will naturally produce more heat than a 5W charger.
2. Battery Management Systems (BMS) Regulate Heat
Most devices include smart thermal management, slowing down the charge when it’s too hot. Heating is normal within a range (up to 45°C), especially in the first 30 minutes.
3. Environmental & Usage Factors
· Thick cases trap heat
· Charging while gaming or watching videos = double workload
· Direct sunlight or hot rooms (common in Spain, Italy, South Korea summers) make it worse
🛑 When Charging Heat Becomes a Problem
| Symptoms | Normal | Warning |
| Warm to the touch | ✔ | |
| Too hot to hold | - | ⚠ Overheating risk |
| Charging Stops intermittently | - | ⚠ Thermal throttle |
| Swolln battery or shutdown | - | ⚠ Battery damage |
If your phone regularly overheats, stop charging immediately and check your charger quality.
🔧 How to prevent overheating when charging
✅ Use original or certified or high-quality PD/PPS chargers
✅ Avoid charging in places with high temperatures or direct sunlight
✅ Remove thick phone cases when charging
✅ Do not charge while playing games or video calls
✅ If the phone is already hot, leave it alone
✅ Use a phone radiator
🚫 Rapid cooling is prohibited
🔋 Choose the right charger: Why GaN is safer
· GaN (Gallium Nitride) chargers generate less heat than traditional silicon-based chargers
· They are more compact, more efficient and safer
· High-quality charger factory/manufacturer that provides multi-port GaN chargers (5W-140W), perfect for iPhone, Samsung, Xiaomi, iPad and MacBook
👉 Check out:
✅ What is the lifespan of GaN chargers?
✅ How fast chargers work and how safe they are
🌍 Europe & US: Is Overheating a Common Problem?
With more adoption of fast-charging standards in EU countries, especially Germany, UK, France, Poland, Italy, and South Korea, overheating during fast charging is increasingly discussed.
That’s why EU buyers and Korean distributors prefer charger manufacturers that offer:
· Built-in thermal control
· PPS support for Samsung & Android
· Certified PD for Apple, CE, CB, ROHs, GRS, ect.
· OEM/ODM custom power solutions (like from Zonsan)
🤔 FAQ: Charging & Heat
❓ Is it normal for my iPhone to get hot while charging?Yes, especially during fast charging. It should cool down after 80% or when idle.
❓ Will a 35W or 65W charger damage my phone?
No. Your phone only draws the power it needs — excess is unused. Learn more here:
🔗 Why Your Device Controls the Charging Speed
❓ Are cheap chargers more likely to overheat?
Absolutely. Non-certified or low-quality chargers lack proper heat control and may cause battery damage.
🏭 Why buy chargers from top factories & manufacturers?
As a professional GaN charger factory, we provide the following services:
· OEM/ODM charger development
· CE, RoHS, KC, ERP, BSCI, GRS certification (certification requirements of other countries)
· Support PD3.0 PD3.1, PPS, QC4.0 (all protocols)
· Intelligent temperature control PCB (customizable upon request)
· Customized plug type: European, British, American, Korean, etc.
🔗 Explore our chargers
📢 Conclusion: Heating ≠ Harmful - As long as it is properly controlled
It is normal to get hot when charging. The key is to use a high-quality charger, develop safe usage habits, and choose a trusted power solution supplier (such as Zonsan).
Still worried about heating when charging? Leave us a message or check out our latest guide:
👉 What Should I Do If Apple Fast Charger Not Working?