I changed the 9 year old battery in my 2014 Octavia III this afternoon, swapping the OEM Varta 68Ah for a Bosch 70Ah. The local "cheap" garage wanted £40 to do the change, including the coding, and said it would be a half hour task. Thanks to mshere and his CarScanner tip I did the whole job myself in a leisurely twenty minutes, start to finish! I thought I might as well cough up the £4.69 to get the full app as it appears to be quite capable - so far I've only turned on the needle sweep feature to test it, but I'll be looking through the list to see what else I might try out (cornering foglights might be useful).