They are standard 510 attys, but beware that Cignot guarantees EGO kit parts for 28 days (according to Vicki) and the warranty is
void if you use aftermarket attys. One of the reasons that the Ego
batteries blow is a shorted atty. If the coil welds itself and presents a dead short, the circuitry in the atty will be fried and the battery is dead. If the happens with an Joye atty you are covered. I guess you would have to ship back the fried atty along with the battery if that happened.
I should be getting my Ego tomorrow according to USPS. I ordered a Mega atty and cart to try. I hope to get longer vape time in both respects with the Mega and the 650mah batt.