The fact that power comes straight from the battery means that there is no way to regulate the voltage, meaning that the device will produce less and less vapour as the battery runs out and eventually dies. Mechanical mods last much longer than regulated mods because the latter feature a surplus of electrical components and wiring, any of which can present problems after moderate to long usage. Mechanical mods are perfect for advanced vapers; get yours now with Free UK and World Wide Delivery!