Why does a charger case look discoloured or warped near one corner?

Main answer · Wecent Editorial Team

Short answer: Discolouration or warping in one spot means that area has been getting too hot, often because a component inside is running hot, the charger has been covered or overloaded or a part has failed. It is not safe to keep using it. Unplug it, let it cool, replace it and avoid reusing the same socket until it has been checked.

What the signs mean

Plastic darkens, yellows or softens when it is exposed to heat beyond what it was designed for. The heat usually comes from the part nearest to that spot, such as a transformer or switching component, or from a bad contact at the plug blades.

Possible causes

• Overload. The charger was used above its rating.
• Poor ventilation. It was covered or placed on a soft surface.
• Component fault. A part inside is running hot or failing.
• Loose plug contact. A worn socket creates heat at the blades.
• Poor materials. The plastic is not suited to the temperatures.
• Hot environment. Sun or a hot car adds to the heat.

What to do

1. Unplug the charger if it is safe to do so and let it cool.
2. Do not use it again.
3. Check the socket for burn marks or looseness. If the socket looks damaged, stop using it and ask an electrician.
4. Keep the charger for the seller or authority if you plan to report it.
5. Replace it with a good, marked charger.

Report it

If the product caused a problem, contact the seller and consider reporting it to the consumer safety authority in your country. Take photos of the charger and the socket.

For brands

Treat each report of discolouration as a possible safety issue. Ask for photos, the date code and the use conditions. Compare with thermal data and check batches.

Prevention

Use the charger within its rating, keep it uncovered, and do not use damaged sockets.

Quick summary

A discoloured or warped area means too much heat. Stop using the charger, and report it if it was faulty.

Quick summary

A discoloured or warped area means too much heat. Stop using the charger and report it if it was faulty.

Look for patterns

Compare the affected units by date code, model and market. If several units show the same corner, suspect a design or component issue in that location. A thermal image of a good unit running at full load will often show a hot spot right where the damage appears.

Where this answer says to confirm with Wecent, the detail is not published on the product page and has to come from the datasheet or the factory. General facts come from the regulators, standards bodies or device makers named in the text.