Help! Note 10.1 not charging, no response, after plugging in the power cable

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http://forums.androidcentral.com – After last charge, I used the Note 10.1 on and off for about five or six days without charging. Yesterday got the low battery message, today, plugged in the power cable(with the ac brick): no response so far after about 30 minutes. Shall i keep it plugged in for longer? :( (HowTos)