Slim Design 9mm Diameter
This is perhaps the most widely recognized battery on the market for THC oil. This battery has an output of 3.7 volts, which will suffice for 1.7 ohm and higher resistance cartomizers. Now with the lower resistance cartomizers you might need a stronger battery with a higher voltage output. That is when the Serenity 400 comes into play. This is a button-less battery, simply inhale to activate. You can use the stylus for your phone or tablet. At 18gms and with 510 threads it is a great deal.