These 2 batteries will replace that of your electronic cigarette. insert one directly into the slot provided for this purpose of your e - cigarette and vape in complete peace of mind.. . - specificities. efest e cigarette battery imr 18650 3000 mah x2: . power: 3000mah. voltage: 3.7 v. continuous discharge current: 20 a. maximum discharge current: 35 a. imr composition: lithium ion manganese rounds. to be inserted in the compartment of your e - cigarette provided for this purpose. weight: 46g. . dimensions. 2 accu batteries for electronic cigarette: length x diameter (cm). 6.52 x 1.85cm