Hi mate.
I've never had a battery die like that, but I've heard that is how they tend to go. Years of faithful service with gradual degradation and then boom. Gone. It's why I've tended to replace mine preventatively. With the AGM batteries of whatever they tend to be pricier. Have you looked at ECP, and tried some discount codes?
Can't speak of the D4, but on the D3 you have to code the battery in (or is at least strongly recommended) using VCDS. It's because these cars have battery regulation module doo-dahs (I believe is the correct term) which need to be told the new battery has been fitted. You'd think being so clever it would 'know'.
Hope you get it sorted pronto
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2010 A8 SE Executive 4.2 FSI D4
2007 Mini Cooper S R56
2008 D3, gone, but not forgotten after 9 years and 90k.
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