The Evod Twist Battery has a 510 eGo thread connection with a capacity of 1000mAh.  The Evod Twist is compatible with the majority of popular vape attachments/tanks that are currently on the market.  This pen offers variable voltage (3.2V to 4.8V) & includes several safety protection features (Short Circuit Protection, Atomizer Protection, & Low Voltage Protection).  You are also able to lock your pen with 5-Click Protection to avoid activating your pen accidentally.  Ensure to charge the battery for a minimum of 6-8 hours upon the first charge.  To properly maintain your Evod Twist Battery, do not charge over 4.2V and do not over-tighten charger or atomizer to the battery as it could cause permanent damage to your battery.  Battery life: ~300 charging cycle.