How Long to Charge a Disposable Vape? 7 Golden Rules of Vape Battery Safety E Cigarette Direct How to Charge a Vape Battery Without Charger Safely Today COOL MIX How do i know if my disposable vape is charging? Knowledge Kaiweili Digital Technology Unplug your vape when it's fully charged to reduce the risk of fire. Rechargeable vapes contain batteries which can overheat when left charging for too long and that means fire risk.