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Not sure if it's the same with the a500, but I know both my smartphone and my android tablet with do that (not the flashing red light since those devices don't have it) when it is in use and is using more power that the charging current. Also batteries tend to not charge when it is physically hot (all batteries, not just the ones used in tablets), which is caused by power usage on the device. Check to see if your a500 has some services (apps) running in the background, it will probably charge fine if you let it reboot and let it charge without any services running.