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Re: Does the Phaeton use a single standard 12V battery? (av_audi)

All North American Phaetons are supplied with two batteries. All European Phaetons, except the 6 cylinder version, are supplied with two batteries. A second battery is optional on the 6 cylinder car.
Michael
 

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Re: Does the Phaeton use a single standard 12V battery? (av_audi)

Here's a bit of additional information, with photos. The vehicle power supply battery (the one on the left) is the larger of the two, except on the V10 TDI, which has an equally large battery for the starter. In the past, both the W12 and V8 were fitted with an 85 Ah / 480 A vehicle power supply battery, and a 61 Ah / 330 A starter battery. A 75 Ah / 420 A vehicle power supply battery is being phased in on new production V8's.

The starter battery only provides power for starting the car (and associated relays and electronics involved in the start process), it is never used for any other purpose. If for any reason the starter battery is depleted, the driver can start the car, using the vehicle power supply battery as the source of starting power. The Phaeton on-board power supply control unit (J519 module) will do this automatically if a voltage level of less than 11 volts is detected on either battery.

The driver can also manually invoke the "emergency start" mode. This is done by turning the key fully to the clockwise (start) position, then fully anticlockwise to the accessory position, then to start again.

During cold weather operations (
 

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Re: Does the Phaeton use a single standard 12V battery? (Soki)

Hi Soki:
It's tough to try and provide a production code that will apply to other vehicles, because there could be any number of production codes out there for different battery configurations. But, to give you a point of comparison, my own Phaeton has the following production code:
J2A: Battery Specification 330A (61 Ah) and 480A (85 Ah).
If you can make a scan or a photograph of the sticker in your owner manual that lists all the production codes, and email it to me, I will post a decoding of it here on the forum.
Michael
 

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Discussion Starter · #6 ·
Thanks for all the very interesting information. I was a little surprised by the amperage capablities of the batteries, until you indicated that they get paired up in parallel during cold starts.
 

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Re: (av_audi)

Quote, originally posted by av_audi »
...I was a little surprised by the amperage capabilities of the batteries...

In what respect? Surprised that they were of such large capacity? By comparison, a 39 seat de Havilland Dash 8 Series 200 aircraft, equipped with two engines of nearly 3,000 horsepower each, only uses a 40 Ah battery for starting purposes... that's much smaller that either of the batteries in the Phaeton. That same 40 Ah battery also needs to be able to sustain all navigation and communication equipment for up to half an hour following a total electrical failure in flight, which it does quite adequately. If anything, I'd say the Phaeton is overpowered, in terms of battery capacity.
Michael
 

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Discussion Starter · #8 ·
Re: (PanEuropean)

Quote, originally posted by PanEuropean »
In what respect? Surprised that they were of such large capacity?

Just in comparison to many car batteries that are rated at 700A for cold cranking and close to 900A for regular cranking. Could it be that we are looking at different units?
 

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Re: (av_audi)

You are confusing SAE (860) with the DIN ( 480) numbers.
You know the rest of the world tends to use more sensible units. ( Have lived in the US for more then half my life but rather use metric untis, so much easier to use).
If you look at Michael's picture of the trunk battery you can see the markings pretty well.
 

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Re: (PanEuropean)

Please rehost photos if and when possible.
 

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I dont know if it is poroper thread here but yesetrday I had some very stressful accident. It was something wrong because batter wasn't loading (I saw it on gauge). I decided to to dealership and during my way there car stopped on the road. But the biggest porblem was the fact that it was on tramway track in downtown:banghead: (it caused quiet big traffic jam, what a shame).
Unfortunetelly I thin it can be problem with alternator so somethint very expensive to repair.
Do you know something more about costs? Is it worth to repair? (I have no warranty)
 

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Battery needle fluctuating!

I am a new phaeton owner in CT. I've been researching cars for a while. As a 6 foot man I wanted something with space, luxury, speed and AWD without breaking the bank. Love the car! The best value for all that you get.

Well as for my problem. Noticed the battery needle fluctuates on 14 oh so while driving. Also the overhead lights shimmer when turned on. Is it time for new batteries? Or could it an electrical issue?
 

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Mine does the same thing..

Hello,

Mine has 69,300 miles on her, as of today (just turned).. My battery just started doing this in my car.. Sometimes the lights flicker when I've not been driving her for a few days, I get in her, let her warm up.. The voltage is around 13 or 14 I think..

My tech said the battery needs to be replaced, this was about 4-6 months ago.. I am going to order a new battery and controller end of the month and have both replaced.. She's getting to the point where I may[I/] need to do the emergency starts.

You probably need to change the battery in your Phaeton too.

Thanks,
 

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Gammaray,
Congratulations on your purchase and welcome to the forum!
I'm concerned about the needle fluctuating: in mine and all the other Phaetons I have had an opportunity to drive it's rock-steady on 14 after starting. This, combined with the interior lights also fluctuating only when the engine is on could indicate an alternator charging problem more than a low battery problem. The condition of the alternator can be easily checked by the dealer with the appropriate tools or by you if you have access to an aftermarket tool. In the meantime, I suggest you try the following:
- turn on the engine with the transmission in park, move the car outside and let it idle.
- if the instrument needle and/or the interior lights fluctuate, accelerate and keep the engine running at a steady 3,500 or 4,000 revolutions. If the needle and lights stabilize I'd definitely suspect the alternator.
Stefano
 

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Thanks for the tips, fellow Phaetonians.

I'll get the dealer to check it out next week. Hopefully that's the case. The cars been rock solid from 47,000 to now at 71,000 miles. I put more work in my '97 Infiniti I30 a few years back.
 

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Welcome Gammaray,

I don't know if your problem is battery related or not, but as you read through the forum you will find countless stories where electrical gremlins of all sorts have caused Phaeton owners and their mechanics to spend oodles of time and money chasing their tails, only to ultimately discover that simply replacing the left ("comfort") battery cured all ills. It's a few hundred dollars, and it's so critical to the enjoyment and reliablility of the Phaeton, that I would suggest if there's the slightest chance it's the culprit that you buy a new OEM one. Also, you might want to read these threads to gain a better understanding of this crucial component:

http://forums.vwvortex.com/showthread.php?1900966#post19804242

http://forums.vwvortex.com/showthread.php?1686297



Regards,
Ron M.
 
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