The Ego- C Twist 1300 mAh battery has been made to provide the user with an even bigger battery cell! This means you can vape longer without having to charge as the battery as often. It also has variable voltage capabilities ranging from 3.8V- 4.8V depending on your preference of vapor production. Specification/ Features: 510 Threaded: Compatible with all of our Joye eGo Series atomizers and cartomizers, 510 Series atomizers and cartomizers. Variable Voltage Output: Voltage can be adjusted from 3.2V~4.8VShort Circuit Protection: When a short is detected, the battery will shutdown until the short is removed.Lockable: Press the button 5 times within 1.5 seconds to lock or unlock the battery. The battery LED will blink when switching modes. When the battery is in lock mode, the button is disabled and the battery will not power an atomizer or cartomizer.Atomizer Protection/Cutoff Timer: If the button is depressed for 10 seconds, the battery will shutoff until the button is released.Battery Monitoring/Over-Discharge Protection: The device will monitor the battery voltage and automatically turn off when the battery is discharged, preventing damage to the battery by overly depleting it. The LED will blink 5 times indicating that a charge is need.