I've forgotten to turn off wifi on my Kobo Glo HD (purchased June 2015) for hours at a time and I've never had the battery drain in the way you describe. If it happens again with your very new Kobo Glo HD, I'd suggest contacting Kobo right away about returning it for a replacement.
The tip about turning off Automatic Synch is a great idea. I've now done the same with mine.
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