What should I do if my Huawei matebook x pro i7 won't charge?

Here is official solution copied from consumer.huawei.com, you might take it as your reference.

Check whether the charging indicator light is on or off. If the charging indicator light is off:

Check that the charging cable and power socket you are using to charge your computer are connected and function normally.

Ensure that the charging cable is connected to the right port. Do not connect non USB Type-C data cables to products with USB Type-C ports.

If the charging indicator light is on but the battery cannot charge:

Check that you are using the charger that came with your computer and that it is undamaged and working properly. For best results, use the charger that came with the computer and make sure that it is in good condition. Using a third-party or damaged charger may cause your computer to charge slower, or cause damage to the computer itself.

Check whether you are using the computer in power-intensive scenarios. In certain power-intensive scenarios, such as when you are playing games or watching videos, your computer may charge slower than normal, or the battery level may even decrease while your computer is charging. Check whether your computer charges normally after you close power-intensive apps.

The issue may be caused by a random system error. Press the power button for 10 seconds to force shutdown the computer, then disconnect and reconnect the charger to resolve the issue. Performing a forced shutdown and then disconnecting and reconnecting the charger resets your computer"s charging system.

Below is details of original Huawei matebook x pro i7 battery. If you are interested in it, please feel free to click here to check more. 

Voltage: 7.6V

Capacity: 7410mAh (56.3Wh)

Battery cells: 4-cell

Chemical: Li-Polymer

Battery Color: black

Condition: new original battery

Warranty: 9 months