this is what is written:
from innokin MVP manual
1.Green LED light = battery voltage is more than 3.75 V
2.Yellow LED light = battery voltage between 3.61V and 3.75V
3.Red LED light = battery voltage is lower than 3.61V
4. Red LED will blink for 8 seconds when battery capacity is lower than 3.3V(the device turns off automatically)
Still, you should let the batt drain completely every now and again to conserve charging capacity... I was reminded of it by my local vendor when I complained yesterday. I'll do that today!