The threading on this eSmart Battery is the same as 510 and EGO so can interchange parts. Feels like the size of a cigarillo in your hand for the 11mm diameter. You should be able to get 3-4 hours of Vape time, depending on the user. This battery also comes with battery overcharge and short circuit protection, plus the 5 click on/off switch. Buy today!
See ESMART-510 eCigarette Kit Here