I would do as you suggest.
I don't advocate it ....but.... I changed mine without recoding with no apparent problems.
Battery was same spec as original though.
A garage did say at a later date that they would not now code it for me without fully charging it first. Anyway it never got coded in the end.
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 2006 A8 d3 4.2tdi sport stoke-on-trent.
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