i have a some simple safety tips:
always turn your mod off, when putting it into a pocket, even if placing it in your pocket for only a minute
never carry spare
batteries without having them in a battery rubber sleeve or case
never carry your mod or battery in the same pocket with loose change, metal objects, or tools/keys even in case/sleeve
never charge your mod whether by usb or charger without being in the same room, as in don't leave it unattended
let the battery "rest" as in cool down after charging if it is warm
learned from sonic, when re-wrapping
batteries, take rings or other conductive jewelry like bracelets off first
never leave your mod or batteries to charge where they can be knocked over or off where they are
never store your mod for extended periods with the battery in it if it is a replaceable one
pay attention to your batteries:
if they're getting hot(not warm) with use - stop using them and check your setup, make sure it's right for the coil/watts, no shorts etc
always check them for damaged wraps or the tab crushed in before you use them every time
charge them in a charger if you can, one with a readout is ideal for making sure it's charging correctly
mark the date you started using the battery on the battery when you get them, with a marker, it will let you know when they need to be recycled