If you find that your tank or clearomizer is not firing anymore then this video explains how to fix this common problem.
This usually happens when the center pin has sunk into the battery and requires you to lift up the connection again.
This problem will usually occur if you have been screwing your clearomizer onto the battery too tight. Please be extra careful not to put too much pressure when readjusting the center pin as shown in this guide.
If you have a cheap battery then you may want to consider purchasing a new battery if you are worried about the safety of using this method to fix your eGo battery.