How to tell if the battery needs replacing ? OBDEleven

JP Dom1 · Apr 21, 2022

I have a 2010 7P V8 TDI it looks to have the original Varta battery in so it is 12 years old.
Running OBD Eleven I can see there is a live data chart for "Usable battery charge" and my one is sitting at 34ah out of 105ah my first thing is this does not look correct ?
When starting the car the voltage drops briefly to 8.9v then goes back to normal.
Listening to the radio on with just the ignition on for 20 minutes kills the battery.

The car does a lot of long journeys and generally it is OK but am I right to say it is time to replace ?

SaVAGeSoot · Apr 21, 2022

I highly doubt that's your original battery... if it is, that's an amazing lifespan.

SaVAGeSoot · Apr 21, 2022

I don't see anything in your stats that would concern me. Do you have dual or single with a V8?
Here's my recent replacement as a comparison on this side of the pond.

2014 TDI starter battery replacement - probably...

Well, I've had my '14 since '18, and although it's never not started for me, I did notice it cranking slowly during our winters up here, have had a bunch of codes for low voltage events over the years, have had locks and aux heater codes, and other low voltage hints such as the EMS stepping in...

www.clubtouareg.com

JP Dom1 · Apr 21, 2022

Thanks for the reply @SaVAGeSoot I feel a little better now but will check if I have a cut as that will be a sign that it has been replaced in the past.

PRY4SNO · Apr 22, 2022

The date of manufacture should be on the battery itself.

Are you having issues with starting or any other reason that would lead you to doubt your battery?

How to tell if the battery needs replacing ? OBDEleven

JP Dom1

SaVAGeSoot

SaVAGeSoot

2014 TDI starter battery replacement - probably...

JP Dom1

PRY4SNO

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