The Aspire K2 is a High quality 800 mAh pass-through charge capacity fixed voltage 510 connection battery from Aspire. Features 2 carbon fiber colors to match the K2 tanks. The K2 battery operates at an set fixed 5.5 volts which is around 16 watts using a 1.8 ohm coil or 18 watts using a 1.6 ohm replacement coil. This battery comes with the Aspire K2 Quick start kit.