Most People Are Charging Batteries the Wrong Way, and It Can End in Fire or Electrocution

Nine out of 10 people in France are taking unnecessary risks when they charge everyday devices, phones, tablets, e-bikes, and electric scooters, according to a recent study. The headline number is stark: 91% of users reported habits that can raise the odds of overheating, electric shock, or even a house fire.

The warning lands at a moment when lithium-ion batteries power nearly everything Americans carry, wear, or ride. And the consequences aren’t theoretical. The study found 12% of respondents had already experienced a battery-related incident, an uncomfortable reminder that “charging” isn’t always the harmless routine it feels like.

Even more troubling: 64% said they don’t feel well informed about the risks. Here’s what safety experts and common-sense electrical rules say matters most.

The hidden danger in “normal” charging

Lithium-ion batteries pack a lot of energy into a small space. That’s why your phone lasts all day and your e-scooter can get you across town. But that same chemistry can become unstable if a battery is damaged, overheats, or is fed the wrong power.

When things go wrong, the range of outcomes is wide: a device that runs hot, a battery that swells, toxic-smelling fumes, or, in worst cases, thermal runaway, the chain reaction that can trigger a fast-moving fire.

Water plus a plugged-in phone can be deadly

One of the most severe risks is electrocution, and it’s often underestimated. The article points to a fatal incident involving a young person using a smartphone while it was charging in a bathtub.

The takeaway is simple and non-negotiable: never handle a plugged-in device near water, bathtubs, sinks, wet countertops, or even damp hands. Water conducts electricity, and a charging cable can turn a routine moment into a lethal one.

Overheating and fires: the mistakes that raise the risk

Overheating is the most common warning sign before a battery failure. A device that gets unusually hot while charging, a battery that bulges, or a sharp chemical odor should all be treated as red flags.

Common triggers include a damaged cable, a defective charger, an overloaded outlet, or charging in a place where heat can’t escape, like under a pillow, on a bed, or wedged between cushions.

“In normal use, batteries aren’t dangerous, but if you don’t charge them correctly and safely, overheating or even a fire can occur.”

Use the right charger, cheap knockoffs are a real problem

Off-brand and counterfeit chargers are a repeat offender in battery incidents. They may not meet safety standards or deliver the correct voltage and current for your device, which can stress the battery and increase heat.

The safest move is also the easiest: use the charger that came with your device, or buy a reputable replacement made specifically for your model. If a deal looks too good to be true, it often is, especially online.

Protect your devices from power spikes

Not every charging problem starts with the battery. Power fluctuations, brief surges you might not even notice, can damage chargers and devices over time.

The article recommends basic electrical protection tools many Americans already use for computers and TVs:

• Surge protector power strips:Help divert excess voltage away from your devices.
• Voltage regulators:Stabilize inconsistent power in areas with frequent fluctuations.
• Battery backups (UPS units):Provide short-term power during outages and can smooth voltage changes for sensitive electronics.

Don’t charge unattended, especially overnight

Plugging in a phone at bedtime and forgetting it until morning is practically a national habit. It’s also a risk multiplier: if a charger fails or a battery overheats, you may not notice until smoke or flames force the issue.

If you must charge while you sleep, reduce the danger: place the device on a hard, nonflammable surface (like a nightstand), keep it away from blankets and papers, and don’t tuck it under pillows or comforters.

Where you charge matters more than people think

Batteries generate heat while charging. They’re designed to handle it, until they can’t. Good airflow helps prevent heat buildup, especially for larger batteries in e-bikes and scooters.

Charge on a flat, hard surface with room for ventilation. Avoid soft surfaces like beds and couches that trap heat and can ignite if something fails.

Unplug at 100%, and watch for warning signs

Leaving a device plugged in long after it hits 100% can wear down battery health over time and, in some situations, contribute to excess heat. Unplugging also reduces the chance a charger sits energized for hours unattended.

Make a quick habit of inspecting your gear. Replace cables with frayed insulation, bent connectors, or scorch marks. If a battery swells, don’t puncture it, squeeze it, or try a DIY fix, disconnect it if you can, move it away from anything flammable, and take it to a professional or a proper electronics recycling drop-off.

The bigger picture: small habits, real consequences

Lithium-ion batteries make modern life portable. They also demand a baseline level of respect. The study’s numbers suggest many people still treat charging like an afterthought, until something goes wrong.

The fix isn’t complicated: use quality chargers, avoid water, give devices airflow, don’t charge on soft surfaces, and pay attention to heat, swelling, and smells. Those small choices can be the difference between a normal night and a fire department call.