Firefighters Recommend to Not Charge Phones Overnight
Charging a smartphone overnight is a common practice, but firefighters are now sounding the alarm about the potential dangers involved. Across the country, fire departments are urging people to rethink the habit, citing an increasing number of fires sparked by overheated phones left plugged in for hours.
Why Overnight Charging Can Be Risky
While phones are generally designed to handle long charges, the process can lead to overheating, especially if a phone is on a soft surface, such as a bed or pillow, where heat has nowhere to escape. Firefighter and safety expert Mark Taylor explains, “People often place their charging phones on flammable surfaces, and this traps heat. In some cases, the phone or charger can reach dangerous temperatures, igniting a fire.”
Older Batteries and Worn-Out Cables Are a Hidden Hazard
Lithium-ion batteries, commonly found in phones, naturally degrade over time, making them more susceptible to overheating. As batteries age, their capacity to hold a charge declines, putting additional stress on the internal chemistry when left to charge for extended periods. This aging process, combined with hours-long charging, raises the risk of a phenomenon called “thermal runaway,” where the battery’s temperature continues to climb until it reaches ignition.
Faulty or cheap charging cables only add to the risk. Non-certified cables, often poorly insulated or made from substandard materials, can short-circuit or deliver inconsistent currents, further overheating the device. Firefighters urge consumers to stick to manufacturer-approved accessories to minimize these risks.
Real Incidents Highlight the Danger
Fire departments across the country report numerous incidents involving phones overheating and starting fires while charging overnight. These fires not only destroy property but can also lead to injuries or, in severe cases, fatalities. In one notable case, a home was severely damaged when a phone left charging on a couch overnight caught fire, setting nearby furniture ablaze.
“We see it more often than people realize,” says Battalion Chief Carla Ramirez. “A charging phone left on a bed or sofa can quickly turn into a full-blown fire hazard. It’s a preventable risk, but people need to be aware.”
Fire Department Recommendations for Safer Charging
Fire departments are encouraging the public to adopt the following safe charging practices:
- Charge during the day: Plug in your phone while you’re awake and able to monitor it.
- Use certified chargers: Only use chargers and cables from reputable brands or the original equipment manufacturer.
- Charge on hard, flat surfaces: Avoid placing charging devices on beds, couches, or other flammable surfaces. A nightstand or table is a safer choice.
- Unplug when fully charged: Once the battery reaches 100%, unplugging the device can help reduce battery stress and overheating.
Technology Can Help — But Don’t Rely Solely on It
Many newer phones have built-in charging management features, designed to reduce charging speeds overnight or cut off charging once the battery is full. However, firefighters stress that these features aren’t foolproof. Battery quality, environmental conditions, and accessory quality all play a role in device safety.
As firefighters continue to raise awareness, they hope more people will prioritize safe charging practices, protecting themselves and their homes from preventable fire risks. The key takeaway? Charging smart is about more than convenience—it’s about safety.
