I am happy that I found this post as I am in the exact same situation, having the exact same model and version. I hardly use my tablet anymore, 1st it's honestly not super fast (was not from the very beginning when I bought it 2 yrs ago), 2nd it's always out of battery for the exact same reason you posted. Can't contribute more as I lost already enough time. Perhaps I will become also one of those customers who switches to a different manufacturer later.
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