Solution to the overheating problem of Samsung Galaxy phones
A detailed technical report from How-To Geek, a website specializing in tech tips and solutions, has revealed a simple and effective fix for a chronic issue affecting many Samsung Galaxy smartphone users: overheating during charging. The solution is to completely disable the fast-charging feature.
The report, which is based on an in-depth analysis of Samsung charging circuits, explains that fast charging generates significantly more heat than users typically realize. Fast chargers deliver current at a relatively high voltage, ranging from 9 to 15 volts in some models, whereas standard lithium-ion batteries operate at only 3 to 4.4 volts. This discrepancy requires the phone’s internal components to continuously step down the voltage via converters, a process that dissipates part of the energy as heat. This heat accumulates inside the device and negatively impacts its internal components.
The report emphasizes that heat is the true enemy of battery lifespan and internal component safety. According to Joule’s law of heating, doubling the electrical current results in four times the generated heat. Consequently, despite its apparent speed, fast charging accelerates battery degradation over time and reduces the number of charge cycles the battery can endure. A phone that charges quickly but remains relatively cool will last much longer than one that charges slowly but overheats excessively, as high temperatures cause faster chemical decomposition of the battery’s internal electrodes. Worse still, leaving the phone plugged in all night—a common practice—significantly increases damage. Keeping the battery at full charge places it under electrochemical stress, which gradually wears it down and reduces its maximum capacity.
To disable fast charging on newer Samsung devices running One UI 6.1, 7.0, or later, users simply need to go to Settings, scroll to Battery, and tap Charging settings. Here, separate toggles appear for fast charging and fast wireless charging. On older devices running One UI 6.0 or earlier, the option is located in Settings > Battery > Device Care > Battery > Additional battery settings.
The report warns that these settings cannot be changed while the phone is connected to a charger; the charger must be disconnected first, the setting adjusted, and then the charger reconnected. The report concludes that keeping the phone cool is more important than charging speed in the long run. This can be achieved either by improving hardware through the selection of appropriate chargers or by modifying behavior, such as unplugging the phone once the battery is full, thereby extending the device’s lifespan and preserving its performance.
