The correct term is " resetting the BMS, ". Battery monitoring system " . It's not exactly coded in like a Led headlight would be for instance. In all my years dead AGM batteries won't recharge, infact if the charge levels drop too low ,it ruins an AGM battery . Also a battery that died in cold weather ,but was ok in warm weather was considered to be kaput!!
Some cars, also keep track of the charging profile, and increase the voltage as the battery ages. On BMW/Audi, if you do not register the battery, they will overcharge and kill the new battery in a short time , if the BMS isn't reset.
Maybe try Halfords if Audi prices are too high. They also offer a battery check.