I had thought Segelei was one of the better tanks out there but seems that coils burn out easily. Been using below stated wattage for the most part. Recently got a freemax tank and the difference is night and day. I have a fuceli mod. 2 batteries 20 amp (25r or similar... All are either sony.,samsung or another recommend brand) and have no issue using at 80watts. The coil is not having issues tank is easier to filll(though my dumba** figured out that top slides by accident). I dont know the max that the battery can go to but if i believe with info i got here before with 2 batteries i should be good