
 Originally Posted by 
drivesafe
					
				 
				Hi Dave and while I completely agree with you, but you are talking about “one-Up” situations.
These occur but they are not the norm.
My post was about what DC was claiming, and that his claim is the exact opposite of what is the norm.
I would probably average one or two phone calls a month, from customers who have had their cranking battery going flat every second or third day, and they had to charge it up over night.
They usually phone me after they had gone to their local autoelec or battery supplier and after the battery is tested, the first thing the customer is told, is the battery is fine and they are next told that the isolator is the cause of the flat battery.
When they phone me, I would then ask them to charge the batteries while the isolator was connected, then once the batteries are fully charged, to disconnect the isolator, by either setting the In-Cab switch to STORAGE Mode, or physically removing the cable running between the isolator and the cranking battery.
In almost every case, the cranking battery has died overnight. They replace their cranking battery and everything now works properly.
I am not talking about “one-Up” situations, I am talking about hundreds of customers coming across the same problem.
The above not only demonstrates that modern cranking batteries will hold a surface charge, and for quite some time, it also proves that my isolators, as stated for many years now, allows the auxiliary battery to support and maintain the cranking battery.
While in these situations, it is an extreme case, but it still shows that, with my isolators, the auxiliary battery has played apart in extending the operating lifespan of the cranking battery.
			
		 
	
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