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I wonder if having software that limits charging to top it up to 80 percent only is possible.

Did not work for me with an old Nexus 4. This is a bad idea, but everyone gets to find out for themselves if they do it

Maybe old phones can't do this compared to new ones.

Disabling the battery seems reasonable enough for a device that won't use it again.

If a battery is needed.. plug one into the usb?

AccA app mentioned earlier in the thread. Requires root and seems to only be available on the F-droid app store.