No vent hole and possibly a dangerous battery. I also own a provari and was thinking about buying one of these for a back. Now I know this is not a company I want to do business with. I want a dealer that knows what he is selling.I have also read and seen photos that the vent hole is extremely small. To go on, the vent hole is said to not travel all the way through the end cap, rendering the safety feature either useless or shoddy at best.
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