Trouble getting my Ellipsis 7 to charge

My ellipsis is taking forever to charge. For example, I plugged it in at 9:00 this morning to charge. At that time, there was 23% left. Now, almost 6 hours later, it is only charged to 49%. I know it does not have a removable battery so what can I do? I have plugged it in to 2 different charger cords as well as several different outlets. All giving the same results. Normally, this thing can get a full charge in under 2 hours. Help!!