i was using a charger i got from BestBuy. it was only rated at (output - 5.1V --- 850mA) then i plugged in the cord for the tab into my note 3 charger (output - 5.3V --- 2.0A) and it charges much faster and the red X is gone when i have it plugged in and running at the same time. in conclusion, you need to get a more powerful power supply. you can get a note 3 charger here - http://www.amazon.com/s/ref=nb_sb_noss_1...-alias%3Daps&field-keywords=note%203%20charger&sprefix=note... - and they are cheap! _____________________________________________________________________ if your battery is getting charged really fast and then discharges really fast here is how you fix it (well it worked for me) turn off and unplug device. hold power button for 30 seconds. plug device back up. wait for about 2 min. hold power button for another 30 seconds. this just resets the battery. then you should be good to go.