Ok thank you Mr. P! I will have to check around as the efest 490 batteries i am using are getting battery rattle. I only go sub ohm down to maybe .6 and those are on dual coil drippers only and on my sony 30am 18650 batteries. I will not risk anything stupid to blow a large cloud!!! Does the battery need a button top in 18490 mode?
Thank you for the magnificent work and I LOVE LOVE LOVE my X1.5!!
I am glad you are fond of the X!
It depends on the brand and the version. The EFEST v1 with flat tops have a weaker performance compared to EFEST v2 with a button top. The red AW IMR 18490 batteries many times are referred as 18500 by many vendors, but only the black ICR AW are 18500 actually, while the IMR EFEST v2 18500 with top button is indeed at this size. The IMR AW 18490 is what we recommend, size and performance wise.