We’ve all been there: You plug your phone in, expecting a smooth recharge, but before you know it, it’s too hot to handle. A little heat during and after charging the phone is normal, but a phone that’s too hot to touch could signal a problem — especially if it happens frequently.
The culprit could be anything from a fast charger, an overcharged phone, or trapped heat in a poorly ventilated room. Whatever the reason behind a phone that’s too warm for comfort, it’s important to address heat-related issues as soon as possible in order to prolong battery performance and health.
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Remember, an overheated phone can cause malfunctions, damage internal components, and shorten battery life. Here are some of the most common reasons your phone heats up while charging and how to resolve each cause. The solutions are easier than you might think.
Fusion multitasking
When you’re multitasking — whether you’re binge-watching your favorite show, playing games, or running graphics-intensive apps — your phone requires significant processing power from its CPU and GPU. Add charging to the mix and you risk pushing your device to its limits and possible thermal overload.
When your phone is plugged in, it draws power from the charger to recharge its battery. Charging itself generates heat, especially if you’re using a fast charger. So you have two sources of heat: the ones that require CPU and GPU tasks, along with the charging process itself.
Solution: Prioritize charging your phone over multitasking. When your battery is low, focus on charging first. Once it’s loaded enough, then feel free to perform some tasks.
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Suspicious chargers and cables
If you are using third-party chargers or cables to recharge your battery, you may risk damaging your phone. Chargers that do not support OEM charging standards often lack accuracy in power delivery. Dodgy cables and chargers sold cheaply on big shopping sites may have faulty components that can disrupt power flow. The consequence? Overheating.
Solution: Get away from them. Legit devices are the way to go.
Ventilation problems
The inside of your phone needs air. If your device lacks sufficient space or ventilation while charging, the heat generated by the internal components cannot pass through its body, resulting in heat build-up.
Solution: Make sure your phone has enough space for air to circulate around it. Apple itself recommends removing the iPhone from its case when charging with «certain styles of cases may generate excessive heat, which may affect battery capacity.» If that’s not possible, you should at least avoid placing anything on top of a charging phone. Give it some space — literally.
The setting is enabled by default, but it never hurts to look and confirm.
The overload myth
Most modern devices are equipped with protection mechanisms to prevent overcharging. When your iPhone’s internal lithium-ion battery reaches 100% capacity, for example, charging stops automatically. Starting with the release of iOS 13 in 2019, Apple introduced a tool called Optimized iPhone Battery Charging, which limits charging to about 80% when connected to a charger for an extended period (such as overnight). Many Android phones offer something similar and even have more robust controls for things like transient charging and the ability to limit fast charging.
Solution: Don’t worry about charging your phone overnight, too much.
All that said, if your phone is constantly heating up, it’s a sign that something might be wrong. Consider contacting the manufacturer’s support department. Apple users can make an appointment with the Genius Bar and Samsung users can find relevant details on their website.
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