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This is my battery. Would you say that AGM? It states lead on it. As far as I can tell the only difference in charging AGM than normal lead is AGM goes to 14.7 volts and lead is 14.2 so doesn't do any harm anyway.

I use the ctek 5.0 and it works well. I do however use it on normal mode as apposed to the AGM mode. I checked the battery in the boot of mine and it doesn't say it's AGM so thought it was safer to go with normal mode. Is that a problem? How can I be sure it's an AGM battery?

Did you ever get the interior lights sorted? I have just bought a 2013 RS4 and have the exact same issue. Blip the throttle and certain illuminated buttons go off and then flash back on.