Hi, I just got my momo11 today. It came from China and so the battery was more or less fully discharged. But even with it plugged in it boots off immediately. I left it charged for about half an hour and it still only stayed charged long enough to get into the desktop. Is this normal? Do I have to let it charge overnight since it is new? All the instructions are in Chinese so I have no idea. My Acer tab works fine as long as it is plugged in. thanks