Hey this is my first post Idk if anyone will read it that knows but, I don't know much about batteries every where I try to learn about them is so complicated. Anyway, I had 18650s Orbtronic brand. And a night core v2 charger. I haven't used these batteries in like 6 months, but back then they worked fine. Today I got a new mod and tried to charge them- the night core lit up one time and then no lights, no charging. Tried again and tried another plug but they won't charge. Are they dead, do I need new ones? Is it because they were unused for so long? I hope it's not the charger as well. Also I don't kno what brands of 18650s I should be getting, or what the amp stuff means- it really confuses me- all I know is the mod I'm using is a vaporesso polar kit. when I got the Ortronic batteries they say they are ultra high drain 30 amp. What should I be looking for for this mod I have ? Lol thanks for any info!!