If it's drained in nitdroid you just need to plug in charger and when it stops blinking unplug charger and press and hold power button for 5-10 secs and then repeat for a while, plug in charger let it blink till it stops, unplug and press power button etc.
At some point after doing this for a few min. press power button to turn on without charger plugged you'll be able to get it to boot to sillyboot and then just boot nitdroid as that needs less power to power on, if it boots into nitdroid then plug in charger and let it charge in nitdroid. If it doesn't boot to sillyboot repeat above.

Or you could see if flasher detects it's through flashing prcedure and see if it will charge that way.

I've tried this a few times and it wont charge after the blinking stops unless you do the above.

Regards Dousan...