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			There are a few choices but it seems that most of the "disk" type are rated for 1.5-3v. I'm not sure how well they would work on 7.2v. They might turn into projectiles! 
		
		
		
		
		
		
		
		
	
	  I want to run them on simple RC switching relays so they will be on at full voltage. Space is a premium inside these things so I need to keep them simple... That and my brain doesn't process complicated stuff well... 
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