Hey fellow vapists, I got a voltmeter for my box but it takes too long to pull a reading, which wastes juice and power. I also had a junky 18650 charger lying around, and I got to McGyvering. Real simple, just broke the PC board in half to make room for the meter, and cut away at the plastic housing to make a window, then soldered the wires. As you can see I did it backwards, go ahead and laugh, I did. Take that around whenever you need to check your voltage 
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