vessel compass 510 batteryHigh Capacity Power and Precise Control The Compass is driven by a large 550mAh battery, providing more than double the power of standard portable vaporizers. It features four variable voltage settings, so it is easy to find the perfect temperature for your specific oil profile. Weve found the intuitive button and 3 LED indicator make it very simple to cycle through power levels and monitor your battery life at a glance. Its a rugged yet refined bit