Pandoras Curse

I set it back to 2.5 hoping it would fix it, to no avail.

bounces between 3.5-4 while firing and not firing it sits at 4.049. I have cleaned the mod spotless with 91% isopropyl alcohol. The battery is as snug as a bug in a rug.

bounces between 3.5-4

I purchased a Vicious Ant Spade 18650 Dna75c and regardless of the battery I use it always ends up saying check battery. The battery can be fully charged as well. I have cleaned the contacts, done everything I know to do but the issue persists. If anyone can point me to a fix or what I should do to get this issue to subside I would greatly appreciate it.