Vapes use lithium ion batteries, and leaving them plugged in once fully charged can be a fire hazard. You shouldn't leave vapes charging unattended, or while you're asleep or for that matter Advances in Lithium ion Battery Technology and the Evolution of Rechargeable Vape Devices Rechargeable vapes use lithiumion batteries, which can react badly to sudden changes in temperature. To help prevent your vape from becoming a fire risk, keep these tips in mind: Keep your vape Turning Disposable Vapes into a Fast Charge Power Bank Unsafe disposal of millions of vapes a week causing environmental damage and rise in lithium ion battery fires British Safety Council