Originally Posted by Wolf359
Originally Posted by UG_Passat
Was in NJ, so it saw all 4 seasons. Now SoCal, by the coast, so nothing extreme like desert heat, which is a battery killer.
My old Passat had a Varta battery (Johnson Controls), which I replaced after 5 years, as a safe measure with an Interstate that my mechanic sells.
And I drive it more than enough daily, with a 30 mile one-way commute.
I don't want to call it a conspiracy theory, but the cynical would say it's just VW up to more tricks. One other way to game the CAFE numbers is to not charge the battery as much during the drive cycle. So instead of software to detect if it's in the drive cycle, just make it automatic so that it assumes it's in the drive cycle and either not charge the battery or use more battery power til it drops below a certain state and then charge it. But then it doesn't charge it enough to keep it fully charged and hence they die earlier. Too bad you can't see the source code to see what they're really doing.
Or it's just a bad Exide battery as they did declare bankruptcy at one point.
This car doesn't have the battery code you enter into the ECU, like some of the newer cars. If an AGM was installed, on a car that was coded for the flooded lead-acid, then it would not charge properly as the charging profile for AGM is different.
https://www.youtube.com/watch?v=IJAScg6JrYI
I suspect it's a bad Exide battery.
The replacement battery, 000915105DE (61 Ah) can either be a Exide or Varta battery.
The stock battery, 5K0 915 105D (60 Ah) can also be either an Exide or Varta battery