charger auto switch when full?

hi there, does anybody know if there is some sort of socket that switches off when there is no current for a while? my charger basically charges full and then stops charging but it technically is still on.
I want to be able to leave it and know it’s disconnected when its done its job.
any suggestions?
thanks

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You could also use a plug and “Alexa, turn off skateboard” or something similar.

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thanks, yeah i know about the timers. i was wondering if there is something measuring low current