sigelei ZMax is definitely a good device but it isnt perfect out of the box thats for sure. It was meh at first with efest 18650s...then i bought some Panasonic NCR18650PF's, cleaned the threading om every piece and lubed it up. Its like a whole new PV. Hits better...no more misfires. It used to drive me mad that randomly it would "reboot" and cycle menu mid vape. Cleaning and lubing the threads makes a HUGE difference
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