Ego just means threading. Most batts these days are 510 threaded and some, like yours are also threaded to accept clearos with ego threading. "Invented" is a loooong story but for ease of explanation, Joye invented it but others now copy it. Joye also invented the Twist. Now others, like the brand you have, have taken to calling their variable voltage "Twist" Smoktec is one of those like yours. In my opinion, they're inferior products and you well might be experiencing the consequences of that. But, you also have to figure what resistance atomizer you're using (ohms) in the clearomizer as that will affect how long your charge lasts. For instance a 650 mah battery should last about 6 and a half hours but if you're using a low resistance atty it can cut that time in half... add chain vaping to that and it could be a lot less. In your situation, I would contact the vendor and tell them what's happening. If they're a decent one, they'll make it right or at the very least explain what's happening to you since they are the ones who included the clearo (atty resistance) in the kit.