The Limited Edition Gold SLIM Battery pairs best with theLimited Edition Gold ConNectar or any 510 threaded cart! With a 400 mAh battery with three different power settings [Low (2.8v),Medium (3.4v), andHigh (4.0v)] the SLIM battery allows you to pick the setting thats right for you! With a double tap Pre- Heat function and a micro USB charger this is the perfect discreet on the go battery for you!