When it comes to vaping using advanced box mods and hybrid tanks - tanks that can operate at sub ohms and higher - it is very essential to be well versed in battery safety.
It is far too common these days in vaping for batteries to explode (burst open) while in use or on standby due to improper matching of hardware. This article (link below) that we came across and served as a great resource for us in explaining the relation between mods, batteries, output and different coils with different ohms.
http://onvaping.com/battery-safety-and-ohms-law/
Please take time to read through and get familiarized on battery safety and proper matching of hardware.