Disable charging for sampling iPhone / iPad via usb

When sampling from my iPhone 15 Pro I’ve noticed that my Field is also taking a charge from the iPhone at the same time which is neat but also annoying as theres no way to disable reverse charging. So I thought I’d try sampling from an old iPad Air instead, which works but I’ve noticed that the iPad is now taking a small charge from the Field. On the iPad screen it says ‘not charging’ but it definitely is as its % charge is going up, albeit slowly.

Is there a way to disable charging on the Field?

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there is an option in the menu yes
does it actually disable charging? hmm