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Personally, for what they cost (but not VW dealer prices!), I would always change both at the same time anyway.
 

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Interesting that on my car, which had VW banded batteries in it still, the one under the seat was larger (longer) than the one in the trunk. Like the Interstate H9 specs above.
 

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thanks for that V10Touareg1, not sure what you mean by &amp 'house battery'? i put a varta din 100 AGM under the front seat. I1 varta 393x175x190h, 920CCA, 110 AH,

So now 2 or so years on the front battery is dying again? thankfully the self jump start system works. if the $440 battery only last 2 years, maybe a cheaper battery is better value?


what I can't get my head around is if the rear battery is the starter how come when the front battery is flat the engine won't crank over?


I fitted a C-Tek battery monitor to the front battery starting at 40% charge, the jump large volt ups are when I put an external charger on.
 

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As I understand it the front ancillaries battery helps the rear starting battery start the car by operating several of the start functions.

When the starting battery is dead the ancillary battery shuts down a number of the ancillary functions so it can start the car on its own.

Reading your post seems to indicate if the front battery is kaput the rear battery can't do the job on its own.

Regardless of what I think, it's all explained in the VW Touareg Self Study Programme 298.
 

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thanks Noobytoogy I believe you, But to me electricity is a mystery of smoke and mirrors.

one thing I know is, when the smoke comes out of the wires one must get an electrician to put the smoke back in...
 
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Ragman
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