It is natural for smartphone chargers to exhibit a slight increase in temperature while charging a device. Nonetheless, if the charger becomes too hot to touch, it could be indicative of an impending fault that needs to be addressed immediately. Overheated chargers might noticeably decrease your phone battery's lifespan and potentially damage other components of your device. The probability of such chargers transforming into a fire hazard is low, yet is it crucial to be aware of it.

There are several common causes of charger overheating and certain steps that can be taken to solve this issue. The inappropriate use of chargers or cables not intended for a specific model could often lead to overheating. Phone chargers are specifically designed to deliver an exact amount of power, which might not be the case with incompatible or unofficial chargers. More often than not, inexpensive, unofficial chargers are prone to overheating.

Secondly, chargers developing a fault or being shipped with one is an uncommon occurrence, but it is possible. Such faults in the charger can render it incapable of managing the power or voltage circulating within, leading to overheating issues. Older chargers are more susceptible to these issues due to wear and tear.

Thirdly, damaged charging cables can significantly contribute to charger overheating. This damage could manifest as exposed wires or ruptures in the plastic casing. The easiest way to test if the cable is causing the issue is by using a different one and checking if the charger still overheats.

Finally, charging your device in an excessively hot environment or exposure to the sun could also make your charger run hot. In addition, prolonged charging, such as leaving your device to charge throughout the day or overnight, can cause overheating and eventually damage your phone's battery.

To prevent overheating, ensure your charger is always in good condition and keep the charging points and cable connections clean. Using the charger in a cool, well-ventilated area can help avoid this issue. These are some precautions that are highly recommended to ensure the efficient functioning of your smartphone charger.