The original Ooze pen just got SMART! The Smart Battery is a new and improved version of the Ooze 650 Standard. Now featuring an LED screen, 5 voltage levels, a battery indicator, & a type-C charging port. The 650 Standard battery is one of the very first batteries we ever made! The two biggest upgrades the Smart Battery is equipped with are the digital screen at the bottom of the device, and it now includes a USB charger.