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Go Back   TDIClub Forums > TDI Model Specific Discussions Areas > VW Passat Family (NMS and B7) TDIs (2012+)

VW Passat Family (NMS and B7) TDIs (2012+) Discussion area for the 2012+ Passat TDI (North American and rest of world versions versions). The North American model was previously codenamed NMS (New Midsize Sedan) and the version the rest of the world gets is sometimes referred to as B7.

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Old July 6th, 2014, 16:44   #31
n1acguy
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Just looked at the Passat and these batteries are totally sealed.
Can't tell for sure, but it appears to be either a gel type or AGM.
It's in a location where it's likely to get plenty of heat even with the insulation around it.
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Old July 6th, 2014, 21:10   #32
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I have not had very good luck with batteries on my 09 JSW. First died just 2 years into the life. Replaced under warranty. The next one lasted a bit over 3 years... On my 3rd one now. I am guessing the heat on the CR/DPF kills these batteries quicker on MKV and later cars.
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Old July 25th, 2014, 11:50   #33
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My 2011 Jetta TDI had the same issue. Sudden dead batter, 0 Amp output when I tested it at Advance AutoParts. New battery, but had an issue with a dead glowplug in cylinder 1 immediately afterwards. Wondering if trying to jump a completely dead battery did something there.

Back in action after 3 days at the dealer (trying to figure out the cylinder 1 error).
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Old July 31st, 2014, 10:57   #34
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When replaceing battery, if one uses a memory saver plugged into cig. lighter port, does that save error codes, in addition to saving radio stations, clock, ect. ?
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Old July 31st, 2014, 10:59   #35
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I've never tried doing that. It wouldn't work on the Passat anyway because the power port is disabled when the ignition is off.
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Old July 31st, 2014, 15:43   #36
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Mine is still going... since I bought it April 2012.
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Old July 31st, 2014, 16:10   #37
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^^^what he said, but from May of 2012. At one point in time, I found a measuring block in the ECU that showed total number of starts. A few version of VCDS later, I cannot find it anymore. Anyone recall seeing this MB? I was thinking this would be a good measure of battery life, since the starter motor is generally the largest amperage pull on the battery and the MB would be a good measure of durability.
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Old August 1st, 2014, 06:11   #38
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Quote:
Originally Posted by n1acguy View Post
Just looked at the Passat and these batteries are totally sealed.
Can't tell for sure, but it appears to be either a gel type or AGM.
It's in a location where it's likely to get plenty of heat even with the insulation around it.
Nope. The vinyl label has you fooled. Peel it off, and you'll find normal acid wet-cell caps underneath. Also note the white vent/overflow cap on the front side.
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Old August 1st, 2014, 12:26   #39
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Quote:
Originally Posted by tdiatlast View Post
Nope. The vinyl label has you fooled. Peel it off, and you'll find normal acid wet-cell caps underneath. Also note the white vent/overflow cap on the front side.
Thanks!
I caught it just before the plates were exposed. Topped it up with distilled water. Should be good for another year.
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Old February 15th, 2017, 22:30   #40
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Just now replacing the original battery in my car, bought new in April of 2012. Currently at 128500 miles. Sounds like a record for what I've read on these cars. I wonder if doing the DPF delete early on helped prolong the life by getting rid of excessive heat.

The resting voltage is at about 12 and it's barely starting the car and failed to once now. Charging system is working fine at around 14 volts. I knew something was up a few weeks ago when my interior lights didn't come on when I got in. Theres a shutoff once the battery gets low enough. I'm going to go with an Optima yellow top.
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Old February 16th, 2017, 04:56   #41
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Checking back into this thread. Even though it's three years since I did, the nature of the thread would seem to exempt it from "zombie" status. The OEM battery in our Passat, bought new in July '13, is still working fine. Based on what I've read here, I may dig into it and try to expose the cell caps and top the thing up with distilled H2O.......
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Old February 16th, 2017, 09:04   #42
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Replaced our in our '13 maybe 6 months ago. Our car had about 72k on the clock. Car started acting funny, random dash lights coming on, not starting (obviously) and the dash clock acting haywire. new battery, everything loke normal again.
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Old February 16th, 2017, 14:28   #43
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Still have the original...
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Old February 17th, 2017, 11:48   #44
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A gasser, but still on the original battery here four and a half years in.

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Old February 17th, 2017, 14:16   #45
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Had a chance today to check the electrolyte level in the Passat's battery. The labels stripped right off, but the only cell that was a bit down (took maybe 1-2 ounces) was the one nearest the negative terminal, the rearmost one. So that looks pretty good for a battery that's going on 4 years old.
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Last edited by Rico567; February 18th, 2017 at 04:46. Reason: Typo
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