Change it when it can no longer meat a battery test to spec, which has good margin before it starts causing issues, like freaked out ECU or hard starting.
OEM VW Battery lasted 7/8 years, despite me nuking it by foolishly leaving my lights on. Sad day.
I replaced the battery of my 18 SE this year and did not code the battery. I replaced it with an OEM one from VW’s parts department and had no issues
Had my '18 R since May '18 and still on original battery, 25 mile commute to work each way about 1/2 hwy . At 57,000 miles.
OEM battery in my 2016 Jetta with 215k miles is still going strong.
In Mar 2022 I went to the dealer and got a new VW battery for my GTI $151. Not knowing any better, I simply swapped it in the parking lot - I did use a OBD-II device to keep circuits alive while the battery was disconnected. All worked like it should.
Mine crapped out at 34 months. I bought a new one from VW since they had a 5-year warranty on it and it's still going...
OEM battery died at 3 years old / 50,000km. Was tested and deemed defective and replaced for free. Replacement OEM battery is currently 3 years / 45,000km old and I'm a bit nervous on long trips this winter lol. I got it tested last month out of paranoia and it came back all good.
I remember buying a brand new Hyundai in 2016 and the car only turned on once. Then I called them and they said they installed a bad battery and changed it lol. It went on to only last 5 years.
My cousin has a 2018 Atlas and a month ago he called me and said he car wouldn't start. It'd just rapidly click. So I drove over there and gave him a jump. Still wouldn't start. So I thought maybe it's the starter motor. Called a bunch of repair shops and they said the battery is dead and needs to be replaced.
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