Reasons why fast charging suddenly slows down

Fast charging is a feature that many smartphone users love, helping to save time and improve the experience. However, there are many cases where phones that used to charge very quickly suddenly become sluggish, causing confusion for users.

An incompatible cable can turn fast charging into a long wait. (Source: Getty Images)

Here are some common causes and effective treatments:

Damaged or incompatible charging cable

The charging cable is the "bridge" that transmits electricity, but if it is broken inside, the shell is torn, or if you use a type that does not support fast charging, the charging speed will be significantly reduced.

Solution: Double check the cable, try replacing it with a genuine cable or one that is certified to support fast charging like USB-C PD or Quick Charge.

The charger is not powerful enough.

Even if your phone supports fast charging, if the charger only provides low current (e.g. 5W instead of 25W), charging will be slow.

Solution: Use a charger that matches the device's capacity, prioritize genuine types or those from reputable brands such as Anker, Belkin.

Use a charger that matches the device's capacity. (Source: Getty Images)

Charging port is dirty or oxidized

Dust, lint, or moisture can reduce contact between the cable and the charging port, causing interruption of electrical flow.

Solution: Clean the charging port with a dry cotton swab or a specialized tool, avoid using sharp objects that cause damage.

Phone overheats while charging

High temperatures cause the system to automatically slow down charging to protect the battery. Charging while playing games or using a thick case can cause the device to heat up quickly.

Solution: Limit using the phone while charging, remove the case, and place the phone in a cool place.

Battery is worn or degraded

Lithium-ion batteries lose performance over many charge cycles. If the battery is worn out, charging will be slow even with a good charger.

Solution: Check battery health with a dedicated app or bring it to a service center for inspection and battery replacement if necessary.

Faulty or out-of-date software

Outdated operating systems or software conflicts may affect charging performance.

Solution: Update software to the latest version, restart the device periodically to free up memory.

Unstable power supply

Charging via a computer USB port or loose power outlet may result in insufficient current.

Solution: Plug the charger directly into a stable power outlet, avoid using extension cords or poor quality outlets.

Fast charging depends not only on the device but also on accessories, environment and usage habits. If your phone suddenly charges slowly, check each of these factors to fix it in time. A few simple steps can help you get back to optimal charging speed and protect the battery's long-term life.

Mr. Quang

Source: https://vtcnews.vn/nguyen-nhan-sac-nhanh-bong-dung-cham-chap-ar966899.html