As with humans, smartphones thrive within specific temperature ranges. Apple and Samsung devices operate optimally between 32°F and 95°F (0°C-35°C), while Xiaomi phones can handle up to 104°F (40°C). However, as extreme heat events become more frequent, many phones are increasingly operating outside these comfort zones.
When a smartphone exceeds its optimal temperature range, built-in thermal sensors trigger various protective measures such as issuing temperature warnings, reducing performance, or even shutting down the device. These mechanisms are intended to prevent immediate damage, but repeated exposure to high temperatures can reduce battery lifespan and harm other internal components.
Rising Heat-Related Issues
Asurion, a U.S.-based phone insurance provider with about 700 repair stores, reported a 15% increase in battery-related problems during last summer’s record heat compared to the rest of 2023. With this summer expected to be even hotter, understanding how to keep your smartphone cool is more important than ever.
Recognizing Overheating
Smartphones generate heat with nearly every operation, and unlike humans, they cannot cool themselves down. High ambient temperatures can quickly raise a phone’s internal temperature. During Europe’s heat wave last year, temperatures above 45°C (113°F) caused numerous phones to fail on the Italian island of Sardinia.
“When ambient temperatures reach 110°F or higher, or when the device is exposed to direct sunlight on a very hot day, most phones will start to experience issues,” explains Tom Paton, founder of Green Smartphones, an online comparison platform.
Detecting Heat Distress
Most smartphones alert users to overheating. Third-party apps like AIDA64 (available for Android and iOS) and Cooling Master (Android) can also track real-time temperatures. Paton advises a simpler method: if your phone becomes uncomfortable to hold, it’s overheating.
A phone running sluggishly is another indicator, says Nicholas Bains, a smartphone expert at Asurion. The device will slow its processing speed to avoid generating additional heat, though this measure can sometimes be too late to prevent damage. “Your phone can protect itself in the moment, but frequent high heat exposure can have long-term detrimental effects on its performance and battery life,” Bains notes.
Potential Damage from Overheating
High temperatures pose a significant threat to a smartphone’s battery, which naturally degrades over time but wears out faster with prolonged heat exposure, says Kyle Wiens, CEO of iFixit. Moreover, the adhesive that holds phone screens can weaken and melt at high temperatures.
Paton adds that the central processing unit (CPU) is also at risk if its maximum operating temperature is exceeded. In extreme cases, heat buildup can cause the battery to combust, potentially leading to a fire or explosion. Overheating can also lead to immediate functional issues, such as app crashes and data loss.
Tips for Protecting Your Smartphone
- Avoid Direct Sunlight: Keep your phone out of direct sunlight and away from heat-magnifying areas like car dashboards.
- Reduce Usage: Limit intensive phone use to minimize heat generation. Consider using Airplane Mode to reduce background activity.
- Remove the Case: Removing your phone case can help with heat dissipation. Alternatively, use cases designed with breathable materials for better airflow.
- Charge Smartly: Avoid charging your phone in hot conditions. If necessary, refrain from using it while it charges to prevent additional heat buildup.
- Gradual Cooling: Allow an overheated phone to cool down gradually. Avoid sudden temperature changes, such as placing it in a refrigerator, as this can cause further damage to internal components.
By following these guidelines, you can help ensure your smartphone remains functional and efficient, even as temperatures rise.