Beginners Guide for How to Charge a Vape How to Know When Your 510 Thread Vape Battery Is Fully Charged iKrusher Vapers quick warning If you vape and use the same charging cable for your vape pen and your phone, you could be putting your phone at risk Vape 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.