It never had an AGM from the factory, but if you want to fit one, they work well. They are usually 92-95Ah though and the AGM coding for 95Ah is 3D0915105CE or 000915105CE - this would need programming in to the BEM (battery energy manager).
I had had a LION AGM from Eurocarparts and it has been fine for 6 years and survived a lot of total drains caused by gremlins.
One of the main root causes with the A8 electrical problems is undercharging caused by an overheating connection behind the insulation in the driver's footwell.
There is a thread here about it with photos.
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