I just got my new e-cigs 2 days ago. I bought a starter kit with an ego C and ego C Twist as well as a 510-T kit. I am having trouble with one of the Ego C's. The twist one works fine but the smaller one wont work. I have charged the battery and refilled the tank twice but with no luck. Other than that the Ego C Twist and the 510-T's work fine. Can you please help?