Hi I have a kangertech dripbox and seem to be having some electrical issues. I can only use it when it is plugged in and charging. Even if it shows the battery is fully charged (green light). It only works while it's on the charger. When I try to use it off the charger it blinks 3 times. I have replaced the battery, checked and cleaned the rda contact and the base contact. A little help would be much appreciated. I am way out of my league here.