My Golf R-Line 7.5 was in for its 3rd service on the 27th of December last year. I asked the technician to check the Start-Stop system as the car would not turn off on a regular basis, tendency increasing. On the report it says nothing was found, all is well. Yesterday I noticed a foul smell in the car. When I got home I opened the bonnet to investigate when I saw the battery emitting steam and I could hear it boiling. I rang VW's emergency assist line who sent out a mobile technician. He ended up replacing the battery under warranty. The price of the battery if I had to pay for... $423. WOW!!! I will write a letter of complaint to the service manager at Mile End in South Australia. Not happy.
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Battery almost exploded
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Originally posted by mickofoz View PostMy Golf R-Line 7.5 was in for its 3rd service on the 27th of December last year. I asked the technician to check the Start-Stop system as the car would not turn off on a regular basis, tendency increasing. On the report it says nothing was found, all is well. Yesterday I noticed a foul smell in the car. When I got home I opened the bonnet to investigate when I saw the battery emitting steam and I could hear it boiling. I rang VW's emergency assist line who sent out a mobile technician. He ended up replacing the battery under warranty. The price of the battery if I had to pay for... $423. WOW!!! I will write a letter of complaint to the service manager at Mile End in South Australia. Not happy.
From what I've read premature battery failures (can't hold a full charge) are way more frequent with MQB cars than overcharging.2017 MY18 Golf R 7.5 Wolfsburg wagon (boring white) delivered 21 Sep 2017, 2008 Octavia vRS wagon 2.0 TFSI 6M (bright yellow), 2006 T5 Transporter van 2.5 TDI 6M (gone but not forgotten).
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Sounds like there was a short circuit on the battery? I.e car electrical issue rather than battery, although i suppose a battery could fail internally to short if something from a plate broke off or distorted enough.
Anyway, if no issues with new battery maybe it was something internal to old battery after all.
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Manual MY12 RB Golf R | Bluefin Stg2 | Milltek turbo-back
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We had a similar issue with our work cars.
Had 3 near new (2yr old) Colorado utes have their batteries fail in the exact same fashion you describe. 6 months later we got a recall letter stating there had been a defective batch of batteries shipped with new vehicles.2017 Golf Alltrack 7.5 Premium 135TDI [MY17]
2015 Tiguan Highline 130TDI [MY15]
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It actually sounds like someone either disconnected the battery temperature sensor and/or there was a faulty sensor that didn’t get picked up/fixed when the first battery got destroyed.
People will disconnect the sensor as a way to disable stop/start but this is not a good idea as you can boil your battery like the OP. Not saying this is what the OP did as a faulty sensor/connector will have the same result.
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2017 Tiguan Sportline - Tigger73's 162TSI Sportline
2016 Scirocco R, stage 1, 205kwaw (sold) - Tigger73's Scirocco R Build
2013 Tiguan 155TSI, stage 1, 144kwaw (sold) - Tigger73's 155TSI Build
2011 Tiguan 125TSI, Stage 2+, 152kwaw (sold) - Tigger73's 125TSI Build
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Originally posted by tigger73 View PostIt actually sounds like someone either disconnected the battery temperature sensor and/or there was a faulty sensor that didn’t get picked up/fixed when the first battery got destroyed.
People will disconnect the sensor as a way to disable stop/start but this is not a good idea as you can boil your battery like the OP. Not saying this is what the OP did as a faulty sensor/connector will have the same result.
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Originally posted by mickofoz View PostNope, None of that. Just a faulty battery.
Hose out around the battery to make sure none of the vapor is left on the paint or metal as it could cause corrosion problems in years to come.
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Exactly the same thing happened with my 2018 Tiguan in January.
Roadside assist came out after the car wouldn't start, did a test and battery + alternator passed it. Told me to drive it for a bit to get the charge up.
Next day driving from Gold Coast back to Brisbane the battery cooked itself. Different roadside assist guy came out and replaced the battery straight away, said it was most probably an intermittent internal short that became permanent.
All done under warranty for me, new battery was AGM rather than EFB type.
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Originally posted by Dan_3MPS View PostAll done under warranty for me, new battery was AGM rather than EFB type.
If you have auto stop/start they should have recoded the BCM so it knows about the new battery of a different type.2017 MY18 Golf R 7.5 Wolfsburg wagon (boring white) delivered 21 Sep 2017, 2008 Octavia vRS wagon 2.0 TFSI 6M (bright yellow), 2006 T5 Transporter van 2.5 TDI 6M (gone but not forgotten).
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