The Ultimate Auto-Start Battery.The best Heavy Hitters vaping experience in a quick and easy package. The Heavy Hitters Auto-Start Battery is a convenient fire-and-forget companion for your favorite Heavy Hitters 510 thread cartridges.Easy To Use | 5-Second Time Out | For Use With Bottom Airflow 510 Thread CartridgesPro Tips:LED on battery will flash if battery level is too low for operationStore battery in a cool dry place out of direct sunlightBattery will automatically time out after five seconds of vaporizationCompatible with all 510 thread cartridges USB charger includedHow To Use:To charge twist the threaded end of the battery into charging port on the charger.Plug the USB end of the charger into a compatible power source.The indicator light will illuminate red during charging and green when a full charge is complete.To use the battery twist off the battery from the charger and twist on your favorite Heavy Hitters 510 cartridge and enjoy.