Just a tip for those wishing to use two AW RCR-123 16340 LiFePO4 batteries in their P+ 18650 for 6 volt vaping: Use one thin o-ring under the batteries. Mine came equipped with one thick o-ring and I had been having to crank the top cap down something fierce; I was freaking out because I felt I was putting undue wear on the top rhodium post. Replaced the o-ring and all is good. Perfect fit.
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