IPad air ,i need to undo the latest update,battery life is the worst ,i can't finish my work like that

TOday i just downloaded the latest update of ios it was for fixing bugs but for my iPad it was for killing battery life time
i used the lowest of brightness and canceled all background refreshing and still bad
i need to undo that update immediately
it's useless now to use my iPad with that battery time

what should i do now !
I'm using the teblet plugged into recharger while using it

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