I've purchased the OPII and the 16 zone input/output expansion board, but they dont have batteries.  
Is there a specific type/size of battery I need for these? I presume I need two of them, since the expansion board has battery leads, even though they will both be in the same cabinet (in other words, I don't think I can hook them both up to the same battery).
Thanks,
Chris
				
			Is there a specific type/size of battery I need for these? I presume I need two of them, since the expansion board has battery leads, even though they will both be in the same cabinet (in other words, I don't think I can hook them both up to the same battery).
Thanks,
Chris
 
	 
 
		 
 
		 
 
		