The original battery was installed in my TDI for 4.5 years (VW uses the same battery supplier as Mercedes). It went on to live another half a year in my friend's car. The Exxide Orbital battery that replaced it in 2004 was replaced in 2009 by another OEM battery, and the Orbital now powers my pickup truck.
My SDL has an OEM battery from 2005, and it seems to be in tip top shape. I leave it on a float charger as the car sits. I think the mounting position behind the fake firewall makes it get less hot in the summertime, which is why it's lasted so long.
-Jason
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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket
Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.
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