I'm thinking about buying a ZMAX V3 Telescopic flat top this weekend.  I plan to use it with an 18650 while at home and single 18350 while out and about.  Can anyone tell me if the batteries need be flat or button top?  I thought I remember reading somewhere that a single 18350 flat top was a bit too small to make a good, stable connection.  But, frankly, I've done so much reading it may have been a comment made about an entirely different APV.
Update:
I found the link about battery type/size issues: http://www.stevevape.com/sigelei-telescoping-zmax-v3-expand-your-horizon/. He says a single flat top 18350 is too short. So, you need to get the button tops or use a magnet.
	
		
			
		
		
	
			
			Update:
I found the link about battery type/size issues: http://www.stevevape.com/sigelei-telescoping-zmax-v3-expand-your-horizon/. He says a single flat top 18350 is too short. So, you need to get the button tops or use a magnet.
			
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