I just had my Bolt and Washer mod for the iSeason show up today (Thank You to the Person who shall remain Anonymous). REGISTERING AN AMAZING 0.21V DROP UNDER LOAD! 4.14v charge on the Battery 3.93v Under Load. This is also not a very great battery this is an EH 18650 IMR LiMn I got from madvapes a few months ago and is still one of my most used batteries (though that will change now that I have my iSeason running. I'm completely blown away - my original tests showed a 0.7-0.9v drop.
Care to share what the mod is exactly? Any pics? Does the bolt thread into the sleeve?
That's right around the drop I get with the brass-to-brass 18490 mod.
Glad you're happier with it now.