iPad Pro 2018 3rd party charger only recognized after second plug in

Your third-party (Huawei) USB-C charger might not be fully USB PD (Power Delivery) compliant.

Without delving too deeply into the technical side of USB (you can look it up yourself if you’re really want that level of detail) - the PD protocol allows the charger and PD compatible connected device, such as your iPad, to actively “negotiate” the charging voltage/current. Standard (non-PD) USB charging is generally lmited to 5V at 2.4A.

USB PD, as implemented over USB-C, allows the charger to safely meet the maximum power needs of the device for fast-charge. The Apple 18W power supply, provided with your 11” iPad, already supplies the maximum power that your iPad is designed to handle.

You really shouldn't be using third party power blocks and using Apple branded power blocks.

Also, use certified Apple Mfi charging cables.

Especially with a very expensive, 2018, 3rd gen iPad Pro.

I would never risk non-Apple certified power devices with any new Apple product purchase.

Good way to void any Apple warranties.

You purchased a new and expensive iPad Pro only to be using maybe cheap, non-Apple certified power blocks and cables.

Not a good idea.

Not to mention possible fire risks involved.

Not that funny at all...

If charging your iPhone using a Lightning to USB Type-A cable, then you are connecting using a completely different USB technical specification and cables (USB ver 2.0 or 3.0) - and different electrical/physical interfaces - Apples and Oranges 🙂

Lightning, USB-C (and USB-C PD) are completely different interfaces - it’s not just the differences in the physical connector that you can see.

Universal Serial Bus (USB), despite its apparent plug-and-play simplicity, is actually a suite of quite complex specifications. You have to carefully match devices and cables for everything to work properly. If you follow the rules, everthing works as it should.

USB Power Delivery protocol is not universal - or backwards compatible per-se - although a PD-compliant charger should still provide power to “standard” USBs devices at 5V.

What happens with a PD-compliant charger is that it will default to 5V when a device is initially connected; if a PD-compliant device has been connected, the two devices will then negotiate the highest multually supported voltage/current - to which the PD-compliant charger will then switch.

Your Mac charger is fully PD-compliant. I suspect that your third-party charger is not, or does not properly implement PD - you need to check its specifications.

Note also that you must use the correct cable. USB cables, including USB-C, have differing specifications for power and data support. Choose wisely.

Hope you find this helpful.

What happen to the original charger that came with the 2018 iPad Pro?