5 warning signs that a lithium-ion battery is about to explode and how to prevent it.

Lithium-ion batteries are a core component in most modern electronic devices such as smartphones, laptops, and electric vehicles due to their ability to be recharged multiple times. However, despite advanced technology, this type of battery still poses a risk of fire and explosion if subjected to impact, overcharging, or exposure to harsh environments. Early detection of abnormal signs can help prevent serious accidents.

1. The device is overheating abnormally and the battery is swelling.

Temperature is the most important indicator of battery health. If your device gets so hot that it's difficult to hold even when not performing heavy tasks, this could be a sign of "thermal runaway" (a chain reaction where battery cells heat up each other). When the temperature rises uncontrollably, the battery will release toxic gases and is highly flammable.

Besides temperature, physical deformation such as a swollen battery is also a red flag. Gas buildup inside due to aging or overcharging can cause the device casing to warp or separate. A swollen battery not only reduces performance but also poses a very high risk of explosion if it continues to be plugged in for charging.

2. Strange chemical smell and hissing sounds coming from the device.

If you smell a strong, slightly sweet chemical odor, like solvent or nail polish, coming from the device, it's a sign the battery is leaking electrolyte. These gases are not only harmful to health when inhaled but are also highly flammable and extremely dangerous in enclosed spaces.

More importantly, unusual sounds such as hissing, crackling, or small popping noises are a result of the battery overheating rapidly or internal components expanding suddenly due to pressure. In this case, you need to turn off the device immediately and move it to a well-ventilated area.

3. Signs of smoke - Emergency fire hazard

When the device starts emitting smoke, it means that a combustion reaction has begun inside the battery cells. This is the most critical situation; the smoke is often accompanied by flames that are difficult to extinguish using conventional methods.

Important note:When you see smoke, absolutely do not attempt to remove the battery by hand or use water to extinguish the fire unless you have expertise. Keep the device away from flammable materials, evacuate everyone from the area, and call the fire department if necessary.

How to minimize the risk of fire and explosion in lithium-ion batteries.

To ensure safety during use, users need to follow these guidelines:

• Do not use batteries that have exceeded the manufacturer's recommended number of charging cycles.
• Use genuine chargers or chargers from reputable brands that have safety certifications.
• Avoid leaving the device in high-temperature environments such as car trunks or in direct sunlight.
• If you notice any unusual signs with your battery, take it to a reputable service center for inspection and replacement.
• Always take old, broken batteries to electronic waste collection points instead of throwing them in the regular trash.

Thanh Vinh