The Owners Manual states the following:-
Recommended charging instructions
NOTICE
Failure to follow these recommendations will result in increased ageing and wear of the high-voltage battery.
The high-voltage battery is subject to natural ageing and wear during use. Proper handling helps to maintain capacity and life over the long term. It is therefore recommended to observe the following instructions:
Use the Battery Care Mode function Charging set-up.
Only charge the high-voltage battery to 100 % before a long journey. To do this, use delayed charging (charging for the time of departure) Charging set-up. Once fully charged, drive off as soon as possible.
Avoid leaving the vehicle idle for long periods of time when the high-voltage battery has a high level of charge.
If the vehicle will be parked for a long period of time, leave the high-voltage battery charged from 40 % up to 70 %.
Avoid completely discharging the high-voltage battery, e.g. due to long periods of leaving the vehicle idle with a low state of charge. Set the lower battery charge limit to at least 20 %.
Charge the high-voltage battery mainly with alternating current (AC).
When fast charging with direct current (DC), the charging power is very high. Frequent fast charging (DC) can permanently reduce the capacity of a high-voltage battery.
If possible, avoid leaving the vehicle in high outside temperatures for long periods, especially in direct sunlight.
If the charge level of the high-voltage battery is low after the ride, we recommend starting charging immediately after the ride.
During charging, functions that reduce the charging rate, such as air conditioning or seat heating, may be unavailable or limited.