I have a Delta Max 2000 that I have literally only used once. I left it at a 100% charge and must have forgot to long press the power button to completely turn it off. A few months later I plug it in and the screen comes up but I am getting 0 input from AC and the battery failure light is flashing. How do I bring this thing back to life? There must be some way to fix this I can't believe it could be bricked so easily.