Good result (hopefully) as long as they fit the same "size" of new battery either a VW Group branded Varta or another brand that you can trust, and code it into the car. Going forward, how to get a "good" service life out of a car starter battery?:- a lot will ultimately depend on how you use the car, as in frequency of use and length of journeys. Maybe get a proper safe smart charger/maintainer and use that as and when you feel the need to. I have a Feb 2011 Audi S4 which I don't use on short journeys if possible, I bought a CTEK smart charger to try to make life better for that battery, it was a VW Group branded Varta AGM, it never ever caused me any problems, that car does not have auto stop/start by the way, at the 10 years point, I thought that I had better replace it rather than have to suffer a battery failure due to old age, when away from home, so I replaced it with a Bosch AGM same size, still fit the CTEK now and again if that car is not being used. The original battery is still in my garage, is still being "topped up" every two months and it still, when out of circuit tests as being quite fit. My wife has an August 2015 VW Polo 1.2TSI, with an EFB battery, during Covid I bought a second CTEK(overkill/scatter cash) and made sure it was kept topped up. That car is now at just over 54,000 miles, is used frequently, and its battery still tests okay, auto stop/start still operates if/when I allow it to - the only exemption to that is after a steady dual carriageway, ie no "zooming and braking" it can end up harvesting the battery and so when I arrive at a complex set of traffic lights that have just gone to red, I enable auto stop/start - but it is not available, very annoying watching the extremely "good" average fuel economy slowly drop back a bit! Smart charging is quite good, but could be better so that the situation I outlined does not happen, I know how to avoid it - ie just drive a bit more aggressively just avoiding getting into an accident - but why bother doing that. It's replacement battery, an AGM Bosch, bought in a panic move just before Brexit - when Costco had a good deal running, unfortunately has not been required yet - I'm hoping to off load that into older daughter's 2019 Leon Cupra - but younger generation are not up for spending until after "the event", so her Exide EFB dies slowly but still gets the car started!