How can I turn off battery charging when plugged in to power on a plane?

Hi,
is there an app that can turn off battery charging while plugged in?
I regularly fly from Australia to Europe (22 hours on the plane!) but the power outlet usually stalls when draining too much power
(e.g. 85 Watts for my Macbook Pro battery).
Any solutions available?
I used to just take out the battery, however, that  is not possible anymore on the Macbook Pro.
Thanks for your help.
Christoph

But why turn off battery charging, makes no sense in this case. You either run off the battery or plug it in and run off the battery while it is charging.
The power draw won't change appreciably.
My bad power consumption will change
It would seem the best strategy would be to get on with a fully charged battery plug in the laptop and let it trickle charge as you use it. Given the length of the flight this should give you the longest use with the minimum amount of draw from the seat outlet.

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