the Ooze Quad Flex Battery is a 510 thread, 500 mAh vape pen battery with a square shape. This new shape actually protects the cartridge, your battery will never roll off the edge of the table, cracking your cartridge again! This is a flex temp device; cycle through the 4 voltage levels by clicking the button 3x. This battery will shut off after sitting idly for 12 minutes, which greatly extends the time between charges. Each Quad includes an Ooze Smart USB charger, as well as a USB-C charging port on the very bottom.