Our Bay Smokes branded Battery is compatible with any 510 thread vape cartridge, easy to charge with the included charger or any android charger. The battery is travel-sized and easily fits into any pocket. Great for discreet use. Take advantage of the low temp and pre-heat functions! We generally recommend low temp hits so you get the most flavor and smoothest hits! Pro-tip; use the pre-heat function to get an ultra-low temp hit (double tap button). Begin inhaling after a second or two after preheating so you can get a great flavorful hit! On/Off (tap 5 times) Multi-Voltage function (3 clicks to adjust voltage) 2.0V to 4.0V Preheat function (tap 2 times), holds for 15 seconds. 1 click to stop preheat. Recommended not to charge more than 2 hours to preserve the life of the battery. Short- circuit protection Overcharge protection