I don't think this is normal behavior even with wifi on.
I have a Kobo mini and and 4 hours use = approximately 2% with or without wifi.
If I plug it in to put on books it charges very fast. About 1 minute.
I am thinking you got a bad one and should exchange it.
I have had my Mini for a week now and am so impressed I might have to buy a Glo as well.
Helen
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