I agree with the other above. Never trust a battery with "fire" in it's name. Secondly unless you know the e-bay seller, never buy anything vape related from e-bay. Trust reputable vendors only. Some are Sweet-Vapes, OriginVape, Elev8vape, Yetivape. all of which I have had great success with online purchases. Also good batteries are AW,Samsung 25r, LG, MXJO and efest purple batteries. Never skimp on safety use good batteries and good chargers as other have stated. Hope this helps