The Quad is a flex temp battery, meaning that you can cycle through 4 different voltage settings with a few clicks of the button. We recommend lower settings when using pre-filled carts to preserve the coil that connects to the battery. Click the button twice to activate Preheat Mode: 15 seconds of continuous heating without needing to hold down the button. The battery life of the Quad is great, this is a 500 mAh device. We’ve implemented an auto shut-off feature that shuts the Quad off after 12 minutes of no use. You’ll be amazed at how much this extends time between charges! The Quad can be charged from either end! We include an Ooze Smart USB Charger with every purchase. This is a 510 thread charger that screws onto the top of the battery and is inserted into a wall adapter. This charger has a built-in safety mechanism that shuts off the energy flow from the power source into the battery as soon as the device reaches a full charge. This safety feature is why the use of a non-Ooze charger will void the battery’s warranty. At the opposite end, there is a charging port for a USB-C charger that is sold separately.