So, my opinion on this. I've spent some time looking into the subject of start-stop, battery coding, etc. In my opinion, it really doesn't matter whether it's coded or not. I even drove with a conventional lead battery but an efb was set up, and absolutely nothing happened. I tried various data sets, but it made no difference. The only thing that killed the battery after 2 months was when there was no data set at all on the gateway. Back then, I used it daily, with a minimum of 60km a day.... Regarding voltage, 12.5V when driving is completely normal, that often happens when overrunning and when the SoC is at a good 80-85%.