Maybe a bad batch at the store that you went too? That is not normal battery behavior by any means, especially on a brand new tablet.
Then again, what was the manufacturing date of those tablets... the 7 HD came out a good while ago. Late 2013, I believe. The battery should still have a year or two left in it even at that age... but it certainly is no spring chicken, at the same time.
I'm glad everything worked out well with the 10 inch model. It is nice to have a resolution to the problem in the end.
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