How safe are lithium batteries? I'm using an eGo One Mega, no mods, I don't rebuild the coils. I use Their CLR heads but I just toss them when I need to use a new one. I only use their equipment. Being new to this site, this may post twice. I've been analog free for 6 months and using the joyetech ego one Mega, love it. On very rare occasions you here that nasty phrase "thermal runaway" and boom. I'd like to hear from the pros/vets. I use the ego one Mega as they recommend and only their equipment for it. I know they have protection circuitry and I'm pretty sure I know the answer, just want to hear it from the Vets. Thanks for your time.