Ok guys I just bought 2 PC EFEST PURPLE IMR 20a 18650 3100mAh HIGH DRAIN BATTERY Li-Mn BUTTON TOP and once I insert it and fire, nothing.  There seems to be some space between the battery and the top b/c I could hear it when I shake it and I'm pressing the fire button.  Please help!  I may have to buy another battery which would suck.
	
		
			
		
		
	
			
			 
				
		 
 
		 
 
		 
 
		