My ego battery suddenly stopped working the other day whilst I was using it,I tried pulling up the centerpin as it was a problem I have had on past ego batteries. It worked for about half a day and hasn't worked since. I've tried using my evod style tank and ce4 tank but still no vapour. I tried pulling the pin down on the evod and pull the center pin up so I can almost see it making connenction but no vapour. Any ideas?