Is it possible to charge use an M1 iPad Pro (2020) as USB-C battery pack in a pinch? For example, would it be possible to plug in a MacBook (or any device that accepts USB-C charging) and have the iPad charge the other device?
https://support.apple.com/en-gb/HT209186#:~:text=Use%20your%20iPad%20to%20charge%20other%20devices seems to suggest this only works for a subset of devices e.g. USB-C->Lightning, or iPad to iPad.
Some additional Google suggests that USB OTG (On The Go) support is required, and Google suggests that the M1 iPad Pro (2020) does not support this.
iPad – Use M1 iPad Pro (2020) to Charge Other USB-C Devices
chargingipadusb
Best Answer
No - the iPad does not provide charging power, just accessory level power.
I like Anker PD devices, but you have a ton of options in that space without needing a computer attached to the battery. The Anker 9 series offer more current / faster charge for double the price of the previous unit.