Are you sure that you raised the center pin enough? This is actually a pretty common issue with the center pin not making contact with the atomizer connection. Usually from over-tightening the
tank onto the battery connector.
Does the fire button's light turn on at all? If not, you've got a dead battery. Battery life expectancy drops if you charge the battery overnight while you are sleeping and it stays on the charger too long after being fully charged.
batteries do not like the "trickle charge" that a charger provides to the battery after a full charge to keep it topped off. Too long receiving these trickle charges results in poor battery life and a decreased life expectancy.