I just wanted to let Jay0808 know that I am having about the same problem with the 26650 battery and the nebula mod ; I can fire at 100w useing the 26650 battery in my nebula mod and it immediately drops to 46w , on the other hand I can use the 18650 battery in my nebula mod and it works perfect no problems other than it drains the battery really fast so I always keep a Nother one charged I don’t know if I have a bad battery or watt but I am going to go by Moody’s battery Chart and find me a good battery hopefully that is what it is but I just wanted to let you know you’re not the only one having this problem so take it easy man