Dell venue 7000 battery drain - DRAINS IN MINUTES

Over the weekend I noticed that my Venue 7840, which I purchased only in January, would drain from a full charge to under 12% IN LESS THAN 10 MINUTES. It works fine and stays at 100% charge when plugged in but obviously this is unacceptable. Has anyone had a similar problem or any ideas to fix? It is Android 5.1.

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