Is a vape battery safe?
Yes and no. If you properly take care of a battery, they are safe. If you are careless, continue to use damaged batteries, get them wet, leave them loose in your bag, yes they can be dangerous.
For internal batteries you just need to make sure it's not damaged, or wet and you should be safe.
For external batteries, you need to check the battery, we recommend at least twice a month. Make sure the wrap on the battery isn't falling off and that the battery isn't dented. Also make sure to never leave a loose battery anywhere around metal as that can cause it to activate, which can severely burn or injure you. It can even start a fire.