The Hydrology 9 is a complete game changer when it comes to vaping dry herbs. It works in a similar way to many conduction vaporizers except that it has built-in water cooling that reduces the temperature of your vapor and increases the comfort and pleasure experienced when vaping. The Hydrology 9 is the result of countless design changes and revisions, each one designed to improve the quality, consistency, and performance of the Hydrology 9. With a built-in 2000mAh lithium polymer battery the device lasts anything up to around 15 sessions between charges, largely thanks to its thermal efficiency and the fact it only takes approximately 60 seconds to get to fully up to temperature and the mains charger charges it fully in approximately 2-3 hours.