How to disable auto charge via usb?

So the question is as that: is it possible to disable auto charge when plugging iphone to the macbook in order to save the battery of macbook.
Tried everything but couldn't find any solution. Moreover it seems like I was questioned something like "permit to charge iPhone via usb?" when I first plugged it to the Mac, but I'm not sure
Thanks alot for any help!!

I am reasonably sure since there are no hidden menus to enable this.

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    So the question is as that: if it's possible to disable auto charge when plugging iphone to the macbook in order to save the battery.
    Tried everything but couldn't find any solution. Moreover it seems like I was questioned something like "permit to charge iPhone via usb?" when I first plugged it to the Mac, but I'm not sure
    Thanks alot for any help!!

    Ahh, I understand. Unfortunately, I'm not aware of a solution to the problem, other than not plugging the iPhone into the laptop while the laptop is unplugged. There are cables you can get that prevent syncing when you plug in while allowing the iPhone to recharge, but I'm not aware of anything that works the other way around. Maybe someone else will have an idea.

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