I have had my ipad 2 since early December. I like to turn off devices before charging, so I shut the ipad down and then attach the charging cable. It seems to me that there are no lights to indicate that the device is charging, or to indicate once it is fully charged. Is this correct? Rather than keeping the device shut off while charging, should I keep it on? It gets old thinking it should be fully charged and once I turn on, finding that I am nearly there. Thanks for any assistance!