i own an Audi A4 2.0 TDI 2014.just to let anyone know i replaced the original battery today.its a straightforward diy job if you have
a 10mm spanner and 13mm socket.The audi agents said i have to reprogramme the electrics, but i found out that if you buy the same
specification battery the electrics come back to normal.The only issue was that the exterior mirrors did not operate initially.
but after i switched the central locking on and off once it came back to life.