A6 C6 battery issue.

[Scamp's Walker]

Replaced battery about a year ago and replaced with a 920a VARTA direct replacement of the one already fitted to the car. Car has performed faultlessly until recently when it has started to suffer a flat battery if not used for a while or if used for short journeys. Bettery was completely flat this morning and jump started it then put it on a charger.

Passed a Halfords earlier this evening and they offered to test it for free. Technician came out ans connected up the battery tester and it could not test it as it suggested that there was a large drain on the battery. He then tested via the terminals in the nine bay and the same error codes were present.

Technician had no way of qualifying the diagnosis but suggested a large draw from somewhere or that my battery has an internal fault.

Anyone have any ideas on what to do next? Will running a diagnostic check identify the power drain? Dan I safely remove the battery and get that checked independently or will I need to have it recoded?

Thanks

[Scamp's Walker]

Unfortunately, followed suppliers advice as they suggested that it didn't need coding if I kept charge to car from aux source. Car warns about shutting down in 3 mins but obviously that is of no help unless you are in the car with ignition on. Battery has been on charge all night and car starts strongly at the moment. Suggested to Halfords tech that I remove battery from the car and bring it down on its own as he suggested that that way he could actually test the battery and rule out a fault with that. He also recommended have the diagnostics done at a main dealer to see if that throws up anything. Battery is only a year old and the supplier has told me to send it back and then if there is a fault they will send a new one and refund the postage. So going to have it checked first as I really don't want to send it back only to find that there is nothing wrong with it. I understand that they will only check it in the same way that Halfords or the AA would.

[Scamp's Walker]

Hi, thank you for the great advice. I was reluctant to disconnect the battery without following the suppliers advice but am going to and take it to be checked. If it comes back as ok, having been charged via a CTEK charger, then I am going to get the battery recoded by a friend who has all the relevant kit, and knowhow.
If battery is at fault I am going to forward the readout to the supplier and see if they will be prepared to send me another one based on an independent test, worth a go.
Ironically, car seems much better this week. Also hoping that he may be able to check any drain methodically.