I have the same issue, only it happened to TWO of my working batteries!! I hit my Ego-t and when I released the button, it kept burning the atty. I switched to the other battery and it did the exact same thing... A third one did the same thing but then started working again. The two that don't work: the buttons don't light up at all now and when I screw them on the charger, the buttons don't flash. HOWEVER, if I do the 5 click lock, the button flashes. I have no idea wtf is wrong with two batteries that worked fine before.
My theory is that something got wet somehow (that's the only thing I can come up with as to why this would happen to 2 batteries in a row). I cleaned them as best I could with tissues and I am going to let them sit overnight and see if they work tomorrow.
I just got the C
tank and was wondering if maybe my base or attys were bad, but I tried another atty in the base and had the same issue. I also tried an A
tank and the same thing happens.