Always familiarize yourself with safe usage of your device.
Inspect your batteries before each use to ensure they are free of any damage.
Always make sure to use the proper coil for your device.
Lock your device before putting it in your pocket to prevent accidental firing of the device.
Always make sure your devices and juices are kept out of reach of children.
Always buy e-liquid from a reputable source.
When building coils always be sure to build safely using Ohm's Law.
Batteries should be the same and if used together should charge together as well.