Choosing a power adapter for a laptop is not as simple as "plugging it in and using it". The wrong adapter can cause slow charging and reduced performance at best, and can damage the laptop motherboard at worst. By following these "three steps", you can easily make the right choice.

Before purchasing any new adapter, please locate the power parameter label on your original adapter or laptop. This is the cornerstone of all choices. You need to document the following core information:

1. Output Voltage: Units are volts. Writing Output: XX V.

• Requirements: Must be exactly the same as the original! For example, at 19V, the error should be 0. Too high a voltage will burn the motherboard, and too low a low will not be able to start or charge.

2. Output Current: Units are amps. Writing XX A.

• Requirements: It can be equal to or greater than the original value. For example, the original one is 3.42A, and the new adapter can be 3.42A, 4.74A or higher. The equipment takes power on demand, and the current "big horse-drawn trolley" is safer.

3. Output Power: Units are watts. Writing XX W.

• If not directly indicated, it can be calculated using the formula: power = voltage × current.

• For example: 19V × 3.42A ≈ 65W.

4. Interface type and size:

• Observe the shape, aperture, and pins of the interface. Common ones include circular interfaces (different apertures), USB-C interfaces, etc.

• Requirements: Must be physically matched exactly, otherwise it cannot be inserted.

Core mantra: The voltage must be consistent, the current can be large or small, the power must be sufficient, and the interface must be matched.

If you lose your original adapter or want to upgrade to a higher-powered adapter for your high-performance notebook, you'll need to do a power calculation.

• Method 1: Check the notebook body label
  At the bottom of the notebook or in the battery compartment, there will usually be similar input power requirements, just check it directly.

• Method 2: Estimate according to the type of notebook

• Thin and Light Notebooks/Business Notebooks: 65W is the gold standard, enough to power and charge at full load.

• All-rounders/mainstream gaming laptops: 100W - 140W is recommended.

• High-performance gaming laptops/mobile workstations: Typically requires 180W - 300W or more, always follow factory recommendations.

• Why is the power "better to be big than small"?

• Using an adapter with too little power (such as powering a gaming laptop that requires 100W at 65W) can cause:

1. Charging is extremely slow or even non-charging: all the electricity is used to keep the laptop running.

2. Performance degradation: During high loads (such as playing games and rendering), the laptop will be forced to underclock due to insufficient power supply, resulting in lag.

3. Adapter overload and heat: This will shorten the life of the adapter and even cause safety hazards.

This is a key step to ensure that it "can be plugged in".

1. Circular Interface:

• Pay attention to the inner diameter, outer diameter, and pins. Interface sizes may vary slightly from brand to brand.

• It's best to bring the original adapter or measure the dimensions accurately when purchasing, or choose a brand that offers a wide range of interchangeable interface sets.

2. USB-C Interface:

• This is the trend of modern thin and light notebooks and some gaming laptops.

• The key: it must be confirmed that your laptop supports charging via the USB-C port (usually there will be a battery or lightning bolt sign next to it).

• Protocol Requirements: You must choose a USB-C charger that supports the USB Power Delivery protocol, and its power needs to meet your laptop's needs (e.g., 65W, 100W).

Correct approach:

• Give preference to original adapters.

• Choose a reputable third-party brand and ensure that the parameters match exactly.

• For USB-C charging, opt for GaN PD chargers from reputable brands, portable and efficient.

Firmly avoid:

• Use inferior adapters that are unbranded and do not have safety certifications (e.g., CCC, CE).

• Mix adapters with different voltages.

• Ignore the interface size and "force" insertion.

Before placing an order, please check whether your selection satisfies:

1. The output voltage is exactly the same as the original.

2. Output current/power is equal to or greater than the original value.

3. The physical specifications of the interface are perfectly matched.

4. Products are sourced from reliable brands and have safety certifications.