oem e cigarette Special part of this model battery is the switch button which is smooth with battery tube. It's 510screw-thead, can match differeny atomizerAboutbattery About packing About WarrantyIf the product is damagedon a non-man made case within three months, we guarantee replacement,Then we'll charge the freight that post back to us.and we'll send the OK goods to youwith free.Specialfunction About ego-c kit, there isn'tLCD player,or the voltagevariable (control the vapor)if needed, please point out, specially. We'll introduce the suitable Modelaccording to your inquirement.Warming advice