Had same issues even though my batter indicator says 50% no fire put 100% batteries in and bam it hit got 4 batteries swapping 2-3 times a day waiting for new 3000 mah i never turned if off for first few weeks now i do to conserve battery . I like my V8 baby beast tank better than the V12 this has kept me from smoking Cigarettes for 10 months on vaping having some fun with it and my breathing is Drastically better by better than 100%