I checked all the information you provided to me and I talked to the guy of Audi who is responsible for thedevelopment of the energy management. He was able to explain the behavior we see in the cars:- Before 2016/2017 the energy management tried to charge the 12V battery as good as possible and triedto keep the SOC above 90%.- Since 2016/2017 the strategy of energy management changed. Now we see version 3.0 of energy managementin the cars- The new strategy is, if P-mode is deactivated: Avoid SOC below 70% - if SOC is below 70% the battery will be charged Between 70% and 82% SOC try to not discharge the battery, keep voltage of generator at about 13,5V(dependent on driving condition, acceleration phase). Charge battery during braking phase, up to 15,5V SOC above 82%: charge battery only during braking phase, up to 15,5V. Otherwise reduce generator voltage to 12,2V during accereration- If P-mode is activated, charge 12V battery, independent of driving condition. Voltage depends on type of battery.- These information match to the information in the document you provided to me